18952813 has 4 divisors (see below), whose sum is σ = 20675808. Its totient is φ = 17229820.

The previous prime is 18952799. The next prime is 18952819. The reversal of 18952813 is 31825981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18952813 - 2¹³ = 18944621 is a prime.

It is a super-2 number, since 2×18952813² = 718418241225938, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18952819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 861481 + ... + 861502.

It is an arithmetic number, because the mean of its divisors is an integer number (5168952).

Almost surely, 2^18952813 is an apocalyptic number.

It is an amenable number.

18952813 is a deficient number, since it is larger than the sum of its proper divisors (1722995).

18952813 is a wasteful number, since it uses less digits than its factorization.

18952813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1722994.

The product of its digits is 17280, while the sum is 37.

The square root of 18952813 is about 4353.4828585858. The cubic root of 18952813 is about 266.6190802240.

The spelling of 18952813 in words is "eighteen million, nine hundred fifty-two thousand, eight hundred thirteen".