18947955 has 16 divisors (see below), whose sum is σ = 32649120. Its totient is φ = 9328128.

The previous prime is 18947927. The next prime is 18947963. The reversal of 18947955 is 55974981.

It is not a de Polignac number, because 18947955 - 2⁷ = 18947827 is a prime.

It is an unprimeable number.

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, 48390 + ... + 48779.

It is an arithmetic number, because the mean of its divisors is an integer number (2040570).

Almost surely, 2^18947955 is an apocalyptic number.

18947955 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18947955 is a deficient number, since it is larger than the sum of its proper divisors (13701165).

18947955 is a wasteful number, since it uses less digits than its factorization.

18947955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97190.

The product of its digits is 453600, while the sum is 48.

The square root of 18947955 is about 4352.9248787453. The cubic root of 18947955 is about 266.5962982730.

The spelling of 18947955 in words is "eighteen million, nine hundred forty-seven thousand, nine hundred fifty-five".