18161942 has 16 divisors (see below), whose sum is σ = 27993600. Its totient is φ = 8834280.

The previous prime is 18161903. The next prime is 18161947. The reversal of 18161942 is 24916181.

It is a super-2 number, since 2×18161942² = 659712274422728, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18161899 and 18161908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18161947) 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, 10409 + ... + 12027.

It is an arithmetic number, because the mean of its divisors is an integer number (1749600).

Almost surely, 2^18161942 is an apocalyptic number.

18161942 is a deficient number, since it is larger than the sum of its proper divisors (9831658).

18161942 is a wasteful number, since it uses less digits than its factorization.

18161942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1771.

The product of its digits is 3456, while the sum is 32.

The square root of 18161942 is about 4261.6830008812. The cubic root of 18161942 is about 262.8577350840.

The spelling of 18161942 in words is "eighteen million, one hundred sixty-one thousand, nine hundred forty-two".