18942730 has 32 divisors (see below), whose sum is σ = 35178624. Its totient is φ = 7340736.

The previous prime is 18942691. The next prime is 18942733. The reversal of 18942730 is 3724981.

It is not an unprimeable number, because it can be changed into a prime (18942733) 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, 54417 + ... + 54763.

It is an arithmetic number, because the mean of its divisors is an integer number (1099332).

Almost surely, 2^18942730 is an apocalyptic number.

18942730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18942730 is a deficient number, since it is larger than the sum of its proper divisors (16235894).

18942730 is a wasteful number, since it uses less digits than its factorization.

18942730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 18942730 is about 4352.3246661985. The cubic root of 18942730 is about 266.5717909015.

It can be divided in two parts, 1894 and 2730, that added together give a square (4624 = 68²).

The spelling of 18942730 in words is "eighteen million, nine hundred forty-two thousand, seven hundred thirty".