123355240 has 16 divisors (see below), whose sum is σ = 277549380. Its totient is φ = 49342080.

The previous prime is 123355229. The next prime is 123355259. The reversal of 123355240 is 42553321.

It can be written as a sum of positive squares in 2 ways, for example, as 120165444 + 3189796 = 10962^2 + 1786^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1541901 + ... + 1541980.

Almost surely, 2^123355240 is an apocalyptic number.

123355240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123355240 is an abundant number, since it is smaller than the sum of its proper divisors (154194140).

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

123355240 is a wasteful number, since it uses less digits than its factorization.

123355240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3083892 (or 3083888 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 123355240 is about 11106.5404154489. The cubic root of 123355240 is about 497.7972971164.

The spelling of 123355240 in words is "one hundred twenty-three million, three hundred fifty-five thousand, two hundred forty".