18861672 has 16 divisors (see below), whose sum is σ = 47154240. Its totient is φ = 6287216.

The previous prime is 18861643. The next prime is 18861673. The reversal of 18861672 is 27616881.

It is a self number, because there is not a number n which added to its sum of digits gives 18861672.

It is not an unprimeable number, because it can be changed into a prime (18861673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 392928 + ... + 392975.

It is an arithmetic number, because the mean of its divisors is an integer number (2947140).

Almost surely, 2^18861672 is an apocalyptic number.

18861672 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18861672 is an abundant number, since it is smaller than the sum of its proper divisors (28292568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18861672 is a wasteful number, since it uses less digits than its factorization.

18861672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 785912 (or 785908 counting only the distinct ones).

The product of its digits is 32256, while the sum is 39.

The square root of 18861672 is about 4343.0026479384. The cubic root of 18861672 is about 266.1910173738.

The spelling of 18861672 in words is "eighteen million, eight hundred sixty-one thousand, six hundred seventy-two".