18953857 has 6 divisors (see below), whose sum is σ = 20524182. Its totient is φ = 17495712.

The previous prime is 18953839. The next prime is 18953867. The reversal of 18953857 is 75835981.

It can be written as a sum of positive squares in 3 ways, for example, as 83521 + 18870336 = 289^2 + 4344^2 .

It is a de Polignac number, because none of the positive numbers 2^k-18953857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18953867) 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, 55908 + ... + 56245.

It is an arithmetic number, because the mean of its divisors is an integer number (3420697).

Almost surely, 2^18953857 is an apocalyptic number.

It is an amenable number.

18953857 is a deficient number, since it is larger than the sum of its proper divisors (1570325).

18953857 is a wasteful number, since it uses less digits than its factorization.

18953857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112179 (or 112166 counting only the distinct ones).

The product of its digits is 302400, while the sum is 46.

The square root of 18953857 is about 4353.6027609326. The cubic root of 18953857 is about 266.6239756312.

The spelling of 18953857 in words is "eighteen million, nine hundred fifty-three thousand, eight hundred fifty-seven".