129890738 has 4 divisors (see below), whose sum is σ = 194836110. Its totient is φ = 64945368.

The previous prime is 129890723. The next prime is 129890749. The reversal of 129890738 is 837098921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 126405049 + 3485689 = 11243^2 + 1867^2 .

It is a junction number, because it is equal to n+sod(n) for n = 129890692 and 129890701.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32472683 + ... + 32472686.

Almost surely, 2^129890738 is an apocalyptic number.

129890738 is a deficient number, since it is larger than the sum of its proper divisors (64945372).

129890738 is an equidigital number, since it uses as much as digits as its factorization.

129890738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64945371.

The product of its (nonzero) digits is 217728, while the sum is 47.

The square root of 129890738 is about 11396.9617881258. The cubic root of 129890738 is about 506.4377392808.

The spelling of 129890738 in words is "one hundred twenty-nine million, eight hundred ninety thousand, seven hundred thirty-eight".