404784139 has 2 divisors, whose sum is σ = 404784140. Its totient is φ = 404784138.

The previous prime is 404784137. The next prime is 404784169. The reversal of 404784139 is 931487404.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 404784139 - 2¹ = 404784137 is a prime.

Together with 404784137, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (404784131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202392069 + 202392070.

It is an arithmetic number, because the mean of its divisors is an integer number (202392070).

Almost surely, 2^404784139 is an apocalyptic number.

404784139 is a deficient number, since it is larger than the sum of its proper divisors (1).

404784139 is an equidigital number, since it uses as much as digits as its factorization.

404784139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 404784139 is about 20119.2479730232. The cubic root of 404784139 is about 739.7321522712.

The spelling of 404784139 in words is "four hundred four million, seven hundred eighty-four thousand, one hundred thirty-nine".