400387679 has 2 divisors, whose sum is σ = 400387680. Its totient is φ = 400387678.

The previous prime is 400387651. The next prime is 400387709. The reversal of 400387679 is 976783004.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400387679 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400387639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200193839 + 200193840.

It is an arithmetic number, because the mean of its divisors is an integer number (200193840).

Almost surely, 2^400387679 is an apocalyptic number.

400387679 is a deficient number, since it is larger than the sum of its proper divisors (1).

400387679 is an equidigital number, since it uses as much as digits as its factorization.

400387679 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 254016, while the sum is 44.

The square root of 400387679 is about 20009.6896277778. The cubic root of 400387679 is about 737.0442598091.

The spelling of 400387679 in words is "four hundred million, three hundred eighty-seven thousand, six hundred seventy-nine".