18215950 has 24 divisors (see below), whose sum is σ = 34138440. Its totient is φ = 7231200.

The previous prime is 18215947. The next prime is 18215957. The reversal of 18215950 is 5951281.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18215957) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5640 + ... + 8260.

It is an arithmetic number, because the mean of its divisors is an integer number (1422435).

Almost surely, 2^18215950 is an apocalyptic number.

18215950 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18215950 is a deficient number, since it is larger than the sum of its proper divisors (15922490).

18215950 is a wasteful number, since it uses less digits than its factorization.

18215950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2772 (or 2767 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 31.

The square root of 18215950 is about 4268.0147609867. The cubic root of 18215950 is about 263.1180297859.

The spelling of 18215950 in words is "eighteen million, two hundred fifteen thousand, nine hundred fifty".