123551520 has 48 divisors (see below), whose sum is σ = 389188800. Its totient is φ = 32946944.

The previous prime is 123551501. The next prime is 123551521. The reversal of 123551520 is 25155321.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (123551521) 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, 128220 + ... + 129179.

It is an arithmetic number, because the mean of its divisors is an integer number (8108100).

Almost surely, 2^123551520 is an apocalyptic number.

123551520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123551520 is an abundant number, since it is smaller than the sum of its proper divisors (265637280).

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

123551520 is a wasteful number, since it uses less digits than its factorization.

123551520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257417 (or 257409 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 123551520 is about 11115.3731381362. The cubic root of 123551520 is about 498.0611850438.

The spelling of 123551520 in words is "one hundred twenty-three million, five hundred fifty-one thousand, five hundred twenty".