123291530 has 16 divisors (see below), whose sum is σ = 222511104. Its totient is φ = 49186320.

The previous prime is 123291527. The next prime is 123291541. The reversal of 123291530 is 35192321.

It is a self number, because there is not a number n which added to its sum of digits gives 123291530.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12266 + ... + 19925.

It is an arithmetic number, because the mean of its divisors is an integer number (13906944).

Almost surely, 2^123291530 is an apocalyptic number.

123291530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

123291530 is a deficient number, since it is larger than the sum of its proper divisors (99219574).

123291530 is a wasteful number, since it uses less digits than its factorization.

123291530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32581.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 123291530 is about 11103.6719151819. The cubic root of 123291530 is about 497.7115822674.

The spelling of 123291530 in words is "one hundred twenty-three million, two hundred ninety-one thousand, five hundred thirty".