400344704 has 16 divisors (see below), whose sum is σ = 797561970. Its totient is φ = 200172288.

The previous prime is 400344671. The next prime is 400344719. The reversal of 400344704 is 407443004.

It can be written as a sum of positive squares in only one way, i.e., 289000000 + 111344704 = 17000^2 + 10552^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1563719 + ... + 1563974.

Almost surely, 2^400344704 is an apocalyptic number.

It is an amenable number.

400344704 is a deficient number, since it is larger than the sum of its proper divisors (397217266).

400344704 is an equidigital number, since it uses as much as digits as its factorization.

400344704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3127707 (or 3127695 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 26.

The square root of 400344704 is about 20008.6157442238. The cubic root of 400344704 is about 737.0178890256.

Adding to 400344704 its reverse (407443004), we get a palindrome (807787708).

The spelling of 400344704 in words is "four hundred million, three hundred forty-four thousand, seven hundred four".