1438267320 has 768 divisors, whose sum is σ = 6320332800. Its totient is φ = 283668480.

The previous prime is 1438267319. The next prime is 1438267321. The reversal of 1438267320 is 237628341.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1438267319) and next prime (1438267321).

It is a super-2 number, since 2×1438267320² = 4137225767559964800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1438267321) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 46395705 + ... + 46395735.

It is an arithmetic number, because the mean of its divisors is an integer number (8229600).

Almost surely, 2^1438267320 is an apocalyptic number.

1438267320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1438267320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3160166400).

1438267320 is an abundant number, since it is smaller than the sum of its proper divisors (4882065480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1438267320 is a wasteful number, since it uses less digits than its factorization.

1438267320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113 (or 84 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 1438267320 is about 37924.4949867497. The cubic root of 1438267320 is about 1128.7901322361.

The spelling of 1438267320 in words is "one billion, four hundred thirty-eight million, two hundred sixty-seven thousand, three hundred twenty".