400231520 has 96 divisors (see below), whose sum is σ = 1023176448. Its totient is φ = 147068928.

The previous prime is 400231519. The next prime is 400231537. The reversal of 400231520 is 25132004.

It is a super-3 number, since 3×400231520³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 659057 + ... + 659663.

It is an arithmetic number, because the mean of its divisors is an integer number (10658088).

Almost surely, 2^400231520 is an apocalyptic number.

400231520 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 400231520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (511588224).

400231520 is an abundant number, since it is smaller than the sum of its proper divisors (622944928).

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

400231520 is a wasteful number, since it uses less digits than its factorization.

400231520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 952 (or 944 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 400231520 is about 20005.7871627187. The cubic root of 400231520 is about 736.9484268060.

Adding to 400231520 its reverse (25132004), we get a palindrome (425363524).

The spelling of 400231520 in words is "four hundred million, two hundred thirty-one thousand, five hundred twenty".