400677839 has 2 divisors, whose sum is σ = 400677840. Its totient is φ = 400677838.

The previous prime is 400677799. The next prime is 400677853. The reversal of 400677839 is 938776004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 400677839 - 2²⁴ = 383900623 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 400677839.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400677869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200338919 + 200338920.

It is an arithmetic number, because the mean of its divisors is an integer number (200338920).

Almost surely, 2^400677839 is an apocalyptic number.

400677839 is a deficient number, since it is larger than the sum of its proper divisors (1).

400677839 is an equidigital number, since it uses as much as digits as its factorization.

400677839 is an evil number, because the sum of its binary digits is even.

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

The square root of 400677839 is about 20016.9388019247. The cubic root of 400677839 is about 737.2222615584. Note that the first 4 decimals are identical.

The spelling of 400677839 in words is "four hundred million, six hundred seventy-seven thousand, eight hundred thirty-nine".