400414639 has 2 divisors, whose sum is σ = 400414640. Its totient is φ = 400414638.

The previous prime is 400414589. The next prime is 400414643. The reversal of 400414639 is 936414004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 400414639 - 2⁹ = 400414127 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 400414639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400414669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200207319 + 200207320.

It is an arithmetic number, because the mean of its divisors is an integer number (200207320).

Almost surely, 2^400414639 is an apocalyptic number.

400414639 is a deficient number, since it is larger than the sum of its proper divisors (1).

400414639 is an equidigital number, since it uses as much as digits as its factorization.

400414639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 400414639 is about 20010.3632900555. The cubic root of 400414639 is about 737.0608023322.

The spelling of 400414639 in words is "four hundred million, four hundred fourteen thousand, six hundred thirty-nine".