400393472 has 18 divisors (see below), whose sum is σ = 799223418. Its totient is φ = 200196608.

The previous prime is 400393471. The next prime is 400393501. The reversal of 400393472 is 274393004.

It can be written as a sum of positive squares in only one way, i.e., 352838656 + 47554816 = 18784^2 + 6896^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400393471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 781763 + ... + 782274.

It is an arithmetic number, because the mean of its divisors is an integer number (44401301).

Almost surely, 2^400393472 is an apocalyptic number.

It is an amenable number.

400393472 is a deficient number, since it is larger than the sum of its proper divisors (398829946).

400393472 is an equidigital number, since it uses as much as digits as its factorization.

400393472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1564053 (or 1564039 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 32.

The square root of 400393472 is about 20009.8343821232. The cubic root of 400393472 is about 737.0478144280.

The spelling of 400393472 in words is "four hundred million, three hundred ninety-three thousand, four hundred seventy-two".