18743957 has 2 divisors, whose sum is σ = 18743958. Its totient is φ = 18743956.

The previous prime is 18743953. The next prime is 18743969. The reversal of 18743957 is 75934781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10182481 + 8561476 = 3191^2 + 2926^2 .

It is a cyclic number.

It is not a de Polignac number, because 18743957 - 2² = 18743953 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18743951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9371978 + 9371979.

It is an arithmetic number, because the mean of its divisors is an integer number (9371979).

Almost surely, 2^18743957 is an apocalyptic number.

It is an amenable number.

18743957 is a deficient number, since it is larger than the sum of its proper divisors (1).

18743957 is an equidigital number, since it uses as much as digits as its factorization.

18743957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 211680, while the sum is 44.

The square root of 18743957 is about 4329.4291771549. The cubic root of 18743957 is about 265.6360985812.

It can be divided in two parts, 187 and 43957, that added together give a palindrome (44144).

The spelling of 18743957 in words is "eighteen million, seven hundred forty-three thousand, nine hundred fifty-seven".