400395400 has 24 divisors (see below), whose sum is σ = 930919770. Its totient is φ = 160158080.

The previous prime is 400395383. The next prime is 400395419. The reversal of 400395400 is 4593004.

It can be written as a sum of positive squares in 3 ways, for example, as 307581444 + 92813956 = 17538^2 + 9634^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1000789 + ... + 1001188.

Almost surely, 2^400395400 is an apocalyptic number.

400395400 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400395400 is an abundant number, since it is smaller than the sum of its proper divisors (530524370).

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

400395400 is a wasteful number, since it uses less digits than its factorization.

400395400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2001993 (or 2001984 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 400395400 is about 20009.8825583760. The cubic root of 400395400 is about 737.0489974525.

The spelling of 400395400 in words is "four hundred million, three hundred ninety-five thousand, four hundred".