18857742 has 16 divisors (see below), whose sum is σ = 38247552. Its totient is φ = 6197240.

The previous prime is 18857737. The next prime is 18857749. The reversal of 18857742 is 24775881.

It is a super-2 number, since 2×18857742² = 711228866677128, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18857694 and 18857703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18857749) 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, 21708 + ... + 22559.

It is an arithmetic number, because the mean of its divisors is an integer number (2390472).

Almost surely, 2^18857742 is an apocalyptic number.

18857742 is an abundant number, since it is smaller than the sum of its proper divisors (19389810).

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

18857742 is a wasteful number, since it uses less digits than its factorization.

18857742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44343.

The product of its digits is 125440, while the sum is 42.

The square root of 18857742 is about 4342.5501724217. The cubic root of 18857742 is about 266.1725283207.

The spelling of 18857742 in words is "eighteen million, eight hundred fifty-seven thousand, seven hundred forty-two".