400402520 has 96 divisors (see below), whose sum is σ = 1053168480. Its totient is φ = 136604160.

The previous prime is 400402511. The next prime is 400402543. The reversal of 400402520 is 25204004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 550397 + ... + 551123.

It is an arithmetic number, because the mean of its divisors is an integer number (10970505).

Almost surely, 2^400402520 is an apocalyptic number.

400402520 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 400402520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (526584240).

400402520 is an abundant number, since it is smaller than the sum of its proper divisors (652765960).

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

400402520 is a wasteful number, since it uses less digits than its factorization.

400402520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1033 (or 1022 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 17.

The square root of 400402520 is about 20010.0604696737. The cubic root of 400402520 is about 737.0533662654.

Adding to 400402520 its reverse (25204004), we get a palindrome (425606524).

The spelling of 400402520 in words is "four hundred million, four hundred two thousand, five hundred twenty".