123730520 has 32 divisors (see below), whose sum is σ = 281005200. Its totient is φ = 49027968.

The previous prime is 123730513. The next prime is 123730571. The reversal of 123730520 is 25037321.

It is a congruent number.

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, 10175 + ... + 18734.

Almost surely, 2^123730520 is an apocalyptic number.

123730520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123730520 is an abundant number, since it is smaller than the sum of its proper divisors (157274680).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123730520 is a wasteful number, since it uses less digits than its factorization.

123730520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29027 (or 29023 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 23.

The square root of 123730520 is about 11123.4221352963. The cubic root of 123730520 is about 498.3015973894.

Adding to 123730520 its reverse (25037321), we get a palindrome (148767841).

The spelling of 123730520 in words is "one hundred twenty-three million, seven hundred thirty thousand, five hundred twenty".