188742440 has 32 divisors (see below), whose sum is σ = 439317000. Its totient is φ = 72893184.

The previous prime is 188742419. The next prime is 188742473. The reversal of 188742440 is 44247881.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 170406916 + 18335524 = 13054^2 + 4282^2 .

It is a junction number, because it is equal to n+sod(n) for n = 188742394 and 188742403.

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, 80195 + ... + 82514.

Almost surely, 2^188742440 is an apocalyptic number.

188742440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

188742440 is an abundant number, since it is smaller than the sum of its proper divisors (250574560).

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

188742440 is a wasteful number, since it uses less digits than its factorization.

188742440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162749 (or 162745 counting only the distinct ones).

The product of its (nonzero) digits is 57344, while the sum is 38.

The square root of 188742440 is about 13738.3565247085. The cubic root of 188742440 is about 573.6185513758.

The spelling of 188742440 in words is "one hundred eighty-eight million, seven hundred forty-two thousand, four hundred forty".