400442072 has 16 divisors (see below), whose sum is σ = 794995560. Its totient is φ = 188443264.

The previous prime is 400442057. The next prime is 400442087. The reversal of 400442072 is 270244004.

It is an interprime number because it is at equal distance from previous prime (400442057) and next prime (400442087).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1472078 + ... + 1472349.

Almost surely, 2^400442072 is an apocalyptic number.

It is an amenable number.

400442072 is a deficient number, since it is larger than the sum of its proper divisors (394553488).

400442072 is a wasteful number, since it uses less digits than its factorization.

400442072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2944450 (or 2944446 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 23.

The square root of 400442072 is about 20011.0487481291. The cubic root of 400442072 is about 737.0776343235.

Adding to 400442072 its reverse (270244004), we get a palindrome (670686076).

The spelling of 400442072 in words is "four hundred million, four hundred forty-two thousand, seventy-two".