129638590 has 16 divisors (see below), whose sum is σ = 240877440. Its totient is φ = 50182560.

The previous prime is 129638573. The next prime is 129638591. The reversal of 129638590 is 95836921.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129638591) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 208785 + ... + 209404.

It is an arithmetic number, because the mean of its divisors is an integer number (15054840).

Almost surely, 2^129638590 is an apocalyptic number.

129638590 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129638590 is a deficient number, since it is larger than the sum of its proper divisors (111238850).

129638590 is a wasteful number, since it uses less digits than its factorization.

129638590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418227.

The product of its (nonzero) digits is 116640, while the sum is 43.

The square root of 129638590 is about 11385.8943434409. The cubic root of 129638590 is about 506.1098226943.

The spelling of 129638590 in words is "one hundred twenty-nine million, six hundred thirty-eight thousand, five hundred ninety".