1420003440 has 320 divisors, whose sum is σ = 5172526080. Its totient is φ = 357350400.

The previous prime is 1420003439. The next prime is 1420003447. The reversal of 1420003440 is 443000241.

It is a super-2 number, since 2×1420003440² = 4032819539223667200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1420003447) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5017539 + ... + 5017821.

It is an arithmetic number, because the mean of its divisors is an integer number (16164144).

Almost surely, 2^1420003440 is an apocalyptic number.

1420003440 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 1420003440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2586263040).

1420003440 is an abundant number, since it is smaller than the sum of its proper divisors (3752522640).

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

1420003440 is a wasteful number, since it uses less digits than its factorization.

1420003440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429 (or 417 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 1420003440 is about 37682.9330068666. The cubic root of 1420003440 is about 1123.9917722493.

Adding to 1420003440 its reverse (443000241), we get a palindrome (1863003681).

The spelling of 1420003440 in words is "one billion, four hundred twenty million, three thousand, four hundred forty".