49690639 has 2 divisors, whose sum is σ = 49690640. Its totient is φ = 49690638.

The previous prime is 49690633. The next prime is 49690679. The reversal of 49690639 is 93609694.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 49690639 - 2³ = 49690631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49690631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24845319 + 24845320.

It is an arithmetic number, because the mean of its divisors is an integer number (24845320).

Almost surely, 2^49690639 is an apocalyptic number.

49690639 is a deficient number, since it is larger than the sum of its proper divisors (1).

49690639 is an equidigital number, since it uses as much as digits as its factorization.

49690639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 314928, while the sum is 46.

The square root of 49690639 is about 7049.1587441339. The cubic root of 49690639 is about 367.6417803324.

The spelling of 49690639 in words is "forty-nine million, six hundred ninety thousand, six hundred thirty-nine".