18942690 has 32 divisors (see below), whose sum is σ = 48960576. Its totient is φ = 4662720.

The previous prime is 18942689. The next prime is 18942691. The reversal of 18942690 is 9624981.

It is an interprime number because it is at equal distance from previous prime (18942689) and next prime (18942691).

It is a super-2 number, since 2×18942690² = 717651008872200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18942691) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23896 + ... + 24675.

It is an arithmetic number, because the mean of its divisors is an integer number (1530018).

Almost surely, 2^18942690 is an apocalyptic number.

18942690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18942690 is an abundant number, since it is smaller than the sum of its proper divisors (30017886).

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

18942690 is a wasteful number, since it uses less digits than its factorization.

18942690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48594.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 18942690 is about 4352.3200709507. The cubic root of 18942690 is about 266.5716032679.

The spelling of 18942690 in words is "eighteen million, nine hundred forty-two thousand, six hundred ninety".