400052440 has 16 divisors (see below), whose sum is σ = 900118080. Its totient is φ = 160020960.

The previous prime is 400052423. The next prime is 400052441. The reversal of 400052440 is 44250004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400052441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5000616 + ... + 5000695.

It is an arithmetic number, because the mean of its divisors is an integer number (56257380).

Almost surely, 2^400052440 is an apocalyptic number.

400052440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400052440 is an abundant number, since it is smaller than the sum of its proper divisors (500065640).

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

400052440 is a wasteful number, since it uses less digits than its factorization.

400052440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10001322 (or 10001318 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 400052440 is about 20001.3109570348. The cubic root of 400052440 is about 736.8384967564.

The spelling of 400052440 in words is "four hundred million, fifty-two thousand, four hundred forty".