18717950 has 12 divisors (see below), whose sum is σ = 34815480. Its totient is φ = 7487160.

The previous prime is 18717949. The next prime is 18717953. The reversal of 18717950 is 5971781.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18717953) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 187130 + ... + 187229.

It is an arithmetic number, because the mean of its divisors is an integer number (2901290).

Almost surely, 2^18717950 is an apocalyptic number.

18717950 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18717950 is a deficient number, since it is larger than the sum of its proper divisors (16097530).

18717950 is a wasteful number, since it uses less digits than its factorization.

18717950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374371 (or 374366 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 38.

The square root of 18717950 is about 4326.4246208619. The cubic root of 18717950 is about 265.5131861570.

The spelling of 18717950 in words is "eighteen million, seven hundred seventeen thousand, nine hundred fifty".