400325520 has 320 divisors, whose sum is σ = 1527330816. Its totient is φ = 84664320.

The previous prime is 400325507. The next prime is 400325543. The reversal of 400325520 is 25523004.

400325520 = T₂₇₃ + T₂₇₄ + ... + T₁₃₄₂.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3055855 + ... + 3055985.

Almost surely, 2^400325520 is an apocalyptic number.

400325520 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 400325520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (763665408).

400325520 is an abundant number, since it is smaller than the sum of its proper divisors (1127005296).

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

400325520 is a wasteful number, since it uses less digits than its factorization.

400325520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278 (or 272 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 21.

The square root of 400325520 is about 20008.1363449973. The cubic root of 400325520 is about 737.0061165231.

Adding to 400325520 its reverse (25523004), we get a palindrome (425848524).

The spelling of 400325520 in words is "four hundred million, three hundred twenty-five thousand, five hundred twenty".