123253440 has 56 divisors (see below), whose sum is σ = 391332720. Its totient is φ = 32867328.

The previous prime is 123253433. The next prime is 123253457. The reversal of 123253440 is 44352321.

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

It is a self number, because there is not a number n which added to its sum of digits gives 123253440.

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, 63235 + ... + 65154.

Almost surely, 2^123253440 is an apocalyptic number.

123253440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123253440 is an abundant number, since it is smaller than the sum of its proper divisors (268079280).

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

123253440 is a wasteful number, since it uses less digits than its factorization.

123253440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128409 (or 128399 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 123253440 is about 11101.9565843143. The cubic root of 123253440 is about 497.6603222260.

The spelling of 123253440 in words is "one hundred twenty-three million, two hundred fifty-three thousand, four hundred forty".