400343392 has 24 divisors (see below), whose sum is σ = 789555816. Its totient is φ = 199821312.

The previous prime is 400343381. The next prime is 400343399. The reversal of 400343392 is 293343004.

It is a self number, because there is not a number n which added to its sum of digits gives 400343392.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400343399) 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, 8128 + ... + 29440.

It is an arithmetic number, because the mean of its divisors is an integer number (32898159).

Almost surely, 2^400343392 is an apocalyptic number.

It is an amenable number.

400343392 is a deficient number, since it is larger than the sum of its proper divisors (389212424).

400343392 is a wasteful number, since it uses less digits than its factorization.

400343392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21910 (or 21902 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 28.

The square root of 400343392 is about 20008.5829583207. The cubic root of 400343392 is about 737.0170839123.

Adding to 400343392 its reverse (293343004), we get a palindrome (693686396).

The spelling of 400343392 in words is "four hundred million, three hundred forty-three thousand, three hundred ninety-two".