304090639 has 2 divisors, whose sum is σ = 304090640. Its totient is φ = 304090638.

The previous prime is 304090637. The next prime is 304090663. The reversal of 304090639 is 936090403.

It is a weak prime.

It is an emirp because it is prime and its reverse (936090403) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 304090639 - 2¹ = 304090637 is a prime.

It is a super-2 number, since 2×304090639² = 184942233454856642, which contains 22 as substring.

Together with 304090637, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (304090637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152045319 + 152045320.

It is an arithmetic number, because the mean of its divisors is an integer number (152045320).

Almost surely, 2^304090639 is an apocalyptic number.

304090639 is a deficient number, since it is larger than the sum of its proper divisors (1).

304090639 is an equidigital number, since it uses as much as digits as its factorization.

304090639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 34.

The square root of 304090639 is about 17438.1948320347. The cubic root of 304090639 is about 672.4619006161.

The spelling of 304090639 in words is "three hundred four million, ninety thousand, six hundred thirty-nine".