18742490 has 16 divisors (see below), whose sum is σ = 36331848. Its totient is φ = 6920256.

The previous prime is 18742487. The next prime is 18742501. The reversal of 18742490 is 9424781.

It can be written as a sum of positive squares in 4 ways, for example, as 10233601 + 8508889 = 3199^2 + 2917^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18742490.

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, 71957 + ... + 72216.

Almost surely, 2^18742490 is an apocalyptic number.

18742490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18742490 is a deficient number, since it is larger than the sum of its proper divisors (17589358).

18742490 is a wasteful number, since it uses less digits than its factorization.

18742490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144193.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 18742490 is about 4329.2597519668. The cubic root of 18742490 is about 265.6291683775.

The spelling of 18742490 in words is "eighteen million, seven hundred forty-two thousand, four hundred ninety".