18742690 has 16 divisors (see below), whose sum is σ = 33835392. Its totient is φ = 7475184.

The previous prime is 18742681. The next prime is 18742727. The reversal of 18742690 is 9624781.

It is a super-2 number, since 2×18742690² = 702576856872200, which contains 22 as substring.

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, 1117 + ... + 6223.

It is an arithmetic number, because the mean of its divisors is an integer number (2114712).

Almost surely, 2^18742690 is an apocalyptic number.

18742690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18742690 is a deficient number, since it is larger than the sum of its proper divisors (15092702).

18742690 is a wasteful number, since it uses less digits than its factorization.

18742690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5481.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 18742690 is about 4329.2828505423. The cubic root of 18742690 is about 265.6301132118.

The spelling of 18742690 in words is "eighteen million, seven hundred forty-two thousand, six hundred ninety".