18941957 has 4 divisors (see below), whose sum is σ = 18961740. Its totient is φ = 18922176.

The previous prime is 18941953. The next prime is 18941969. The reversal of 18941957 is 75914981.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14485636 + 4456321 = 3806^2 + 2111^2 .

It is a cyclic number.

It is not a de Polignac number, because 18941957 - 2² = 18941953 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18941953) 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, 8378 + ... + 10395.

It is an arithmetic number, because the mean of its divisors is an integer number (4740435).

Almost surely, 2^18941957 is an apocalyptic number.

It is an amenable number.

18941957 is a deficient number, since it is larger than the sum of its proper divisors (19783).

18941957 is a wasteful number, since it uses less digits than its factorization.

18941957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19782.

The product of its digits is 90720, while the sum is 44.

The square root of 18941957 is about 4352.2358621748. The cubic root of 18941957 is about 266.5681648350.

The spelling of 18941957 in words is "eighteen million, nine hundred forty-one thousand, nine hundred fifty-seven".