18990377 has 16 divisors (see below), whose sum is σ = 23421312. Its totient is φ = 15025920.

The previous prime is 18990373. The next prime is 18990379. The reversal of 18990377 is 77309981.

It is not a de Polignac number, because 18990377 - 2² = 18990373 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18990373) 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, 4802 + ... + 7812.

It is an arithmetic number, because the mean of its divisors is an integer number (1463832).

Almost surely, 2^18990377 is an apocalyptic number.

18990377 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

18990377 is a deficient number, since it is larger than the sum of its proper divisors (4430935).

18990377 is a wasteful number, since it uses less digits than its factorization.

18990377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3088.

The product of its (nonzero) digits is 95256, while the sum is 44.

The square root of 18990377 is about 4357.7949699361. The cubic root of 18990377 is about 266.7951080908.

The spelling of 18990377 in words is "eighteen million, nine hundred ninety thousand, three hundred seventy-seven".