18877994 has 16 divisors (see below), whose sum is σ = 29008800. Its totient is φ = 9210864.

The previous prime is 18877993. The next prime is 18877997. The reversal of 18877994 is 49977881.

18877994 = 157² + 158² + ... + 392².

It is not an unprimeable number, because it can be changed into a prime (18877993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18017 + ... + 19035.

It is an arithmetic number, because the mean of its divisors is an integer number (1813050).

Almost surely, 2^18877994 is an apocalyptic number.

18877994 is a deficient number, since it is larger than the sum of its proper divisors (10130806).

18877994 is a wasteful number, since it uses less digits than its factorization.

18877994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1237.

The product of its digits is 1016064, while the sum is 53.

The square root of 18877994 is about 4344.8813562628. The cubic root of 18877994 is about 266.2677782805.

The spelling of 18877994 in words is "eighteen million, eight hundred seventy-seven thousand, nine hundred ninety-four".