400440651 has 16 divisors (see below), whose sum is σ = 582274560. Its totient is φ = 243303840.

The previous prime is 400440643. The next prime is 400440683. The reversal of 400440651 is 156044004.

It is not a de Polignac number, because 400440651 - 2³ = 400440643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (400440251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61905 + ... + 68066.

It is an arithmetic number, because the mean of its divisors is an integer number (36392160).

Almost surely, 2^400440651 is an apocalyptic number.

400440651 is a deficient number, since it is larger than the sum of its proper divisors (181833909).

400440651 is a wasteful number, since it uses less digits than its factorization.

400440651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130066.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 400440651 is about 20011.0132427121. The cubic root of 400440651 is about 737.0767624633.

Adding to 400440651 its reverse (156044004), we get a palindrome (556484655).

The spelling of 400440651 in words is "four hundred million, four hundred forty thousand, six hundred fifty-one".