736639 has 2 divisors, whose sum is σ = 736640. Its totient is φ = 736638.

The previous prime is 736607. The next prime is 736657. The reversal of 736639 is 936637.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 736639 - 2⁵ = 736607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (736679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 368319 + 368320.

It is an arithmetic number, because the mean of its divisors is an integer number (368320).

2⁷³⁶⁶³⁹ is an apocalyptic number.

736639 is a deficient number, since it is larger than the sum of its proper divisors (1).

736639 is an equidigital number, since it uses as much as digits as its factorization.

736639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20412, while the sum is 34.

The square root of 736639 is about 858.2767618898. The cubic root of 736639 is about 90.3132704484.

The spelling of 736639 in words is "seven hundred thirty-six thousand, six hundred thirty-nine".