190639 has 2 divisors, whose sum is σ = 190640. Its totient is φ = 190638.

The previous prime is 190633. The next prime is 190649. The reversal of 190639 is 936091.

190639 = T₃₅₅ + T₃₅₆ + T₃₅₇.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 190639 - 2⁵ = 190607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (190633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95319 + 95320.

It is an arithmetic number, because the mean of its divisors is an integer number (95320).

2¹⁹⁰⁶³⁹ is an apocalyptic number.

190639 is the 357-th centered triangular number.

190639 is a deficient number, since it is larger than the sum of its proper divisors (1).

190639 is an equidigital number, since it uses as much as digits as its factorization.

190639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 190639 is about 436.6222623733. The cubic root of 190639 is about 57.5533468363.

The spelling of 190639 in words is "one hundred ninety thousand, six hundred thirty-nine".