123557240 has 16 divisors (see below), whose sum is σ = 278003880. Its totient is φ = 49422880.

The previous prime is 123557201. The next prime is 123557243. The reversal of 123557240 is 42755321.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123557243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1544426 + ... + 1544505.

Almost surely, 2^123557240 is an apocalyptic number.

123557240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123557240 is an abundant number, since it is smaller than the sum of its proper divisors (154446640).

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

123557240 is a wasteful number, since it uses less digits than its factorization.

123557240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3088942 (or 3088938 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 29.

The square root of 123557240 is about 11115.6304364620. The cubic root of 123557240 is about 498.0688710845.

The spelling of 123557240 in words is "one hundred twenty-three million, five hundred fifty-seven thousand, two hundred forty".