18964933 has 4 divisors (see below), whose sum is σ = 20423788. Its totient is φ = 17506080.

The previous prime is 18964931. The next prime is 18964951. The reversal of 18964933 is 33946981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 33946981 = 5021 ⋅6761.

It can be written as a sum of positive squares in 2 ways, for example, as 4088484 + 14876449 = 2022^2 + 3857^2 .

It is a cyclic number.

It is not a de Polignac number, because 18964933 - 2¹ = 18964931 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18964933.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18964931) 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, 729408 + ... + 729433.

It is an arithmetic number, because the mean of its divisors is an integer number (5105947).

Almost surely, 2^18964933 is an apocalyptic number.

18964933 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18964933 is a deficient number, since it is larger than the sum of its proper divisors (1458855).

18964933 is a wasteful number, since it uses less digits than its factorization.

18964933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1458854.

The product of its digits is 139968, while the sum is 43.

The square root of 18964933 is about 4354.8746250610. The cubic root of 18964933 is about 266.6759008955.

The spelling of 18964933 in words is "eighteen million, nine hundred sixty-four thousand, nine hundred thirty-three".