18980555 has 16 divisors (see below), whose sum is σ = 24935904. Its totient is φ = 13754880.

The previous prime is 18980537. The next prime is 18980557. The reversal of 18980555 is 55508981.

It is not a de Polignac number, because 18980555 - 2⁶ = 18980491 is a prime.

It is a super-2 number, since 2×18980555² = 720522936216050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18980557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23417 + ... + 24213.

It is an arithmetic number, because the mean of its divisors is an integer number (1558494).

Almost surely, 2^18980555 is an apocalyptic number.

18980555 is a deficient number, since it is larger than the sum of its proper divisors (5955349).

18980555 is a wasteful number, since it uses less digits than its factorization.

18980555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1246.

The product of its (nonzero) digits is 72000, while the sum is 41.

The square root of 18980555 is about 4356.6678780922. The cubic root of 18980555 is about 266.7491038531.

The spelling of 18980555 in words is "eighteen million, nine hundred eighty thousand, five hundred fifty-five".