18990735 has 16 divisors (see below), whose sum is σ = 31092864. Its totient is φ = 9892512.

The previous prime is 18990721. The next prime is 18990761. The reversal of 18990735 is 53709981.

It is a happy number.

It is not a de Polignac number, because 18990735 - 2⁷ = 18990607 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14077 + ... + 15366.

It is an arithmetic number, because the mean of its divisors is an integer number (1943304).

Almost surely, 2^18990735 is an apocalyptic number.

18990735 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18990735 is a deficient number, since it is larger than the sum of its proper divisors (12102129).

18990735 is a wasteful number, since it uses less digits than its factorization.

18990735 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29494.

The product of its (nonzero) digits is 68040, while the sum is 42.

The square root of 18990735 is about 4357.8360455621. The cubic root of 18990735 is about 266.7967845899.

The spelling of 18990735 in words is "eighteen million, nine hundred ninety thousand, seven hundred thirty-five".