39640629 has 16 divisors (see below), whose sum is σ = 60744320. Its totient is φ = 22524480.

The previous prime is 39640619. The next prime is 39640663. The reversal of 39640629 is 92604693.

It is a happy number.

It is not a de Polignac number, because 39640629 - 2⁴ = 39640613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39640609) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1414 + ... + 9015.

It is an arithmetic number, because the mean of its divisors is an integer number (3796520).

Almost surely, 2^39640629 is an apocalyptic number.

It is an amenable number.

39640629 is a deficient number, since it is larger than the sum of its proper divisors (21103691).

39640629 is a wasteful number, since it uses less digits than its factorization.

39640629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10620.

The product of its (nonzero) digits is 69984, while the sum is 39.

The square root of 39640629 is about 6296.0804473895. The cubic root of 39640629 is about 340.9679137802.

The spelling of 39640629 in words is "thirty-nine million, six hundred forty thousand, six hundred twenty-nine".