40399320 has 256 divisors, whose sum is σ = 145152000. Its totient is φ = 8902656.

The previous prime is 40399319. The next prime is 40399321. The reversal of 40399320 is 2399304.

It is an interprime number because it is at equal distance from previous prime (40399319) and next prime (40399321).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40399321) 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, 859537 + ... + 859583.

It is an arithmetic number, because the mean of its divisors is an integer number (567000).

Almost surely, 2^40399320 is an apocalyptic number.

40399320 is a gapful number since it is divisible by the number (40) 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 40399320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72576000).

40399320 is an abundant number, since it is smaller than the sum of its proper divisors (104752680).

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

40399320 is a wasteful number, since it uses less digits than its factorization.

40399320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122 (or 118 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 30.

The square root of 40399320 is about 6356.0459406773. The cubic root of 40399320 is about 343.1294691539.

The spelling of 40399320 in words is "forty million, three hundred ninety-nine thousand, three hundred twenty".