990190639 has 2 divisors, whose sum is σ = 990190640. Its totient is φ = 990190638.

The previous prime is 990190609. The next prime is 990190667. The reversal of 990190639 is 936091099.

990190639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 990190639 - 2²¹ = 988093487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (990190609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495095319 + 495095320.

It is an arithmetic number, because the mean of its divisors is an integer number (495095320).

Almost surely, 2^990190639 is an apocalyptic number.

990190639 is a deficient number, since it is larger than the sum of its proper divisors (1).

990190639 is an equidigital number, since it uses as much as digits as its factorization.

990190639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 118098, while the sum is 46.

The square root of 990190639 is about 31467.2947518531. The cubic root of 990190639 is about 996.7194628443.

The spelling of 990190639 in words is "nine hundred ninety million, one hundred ninety thousand, six hundred thirty-nine".