18780613 has 4 divisors (see below), whose sum is σ = 18795040. Its totient is φ = 18766188.

The previous prime is 18780599. The next prime is 18780617. The reversal of 18780613 is 31608781.

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 18780613 - 2¹³ = 18772421 is a prime.

It is a super-2 number, since 2×18780613² = 705422849311538, 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 (18780617) 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, 5043 + ... + 7936.

It is an arithmetic number, because the mean of its divisors is an integer number (4698760).

Almost surely, 2^18780613 is an apocalyptic number.

It is an amenable number.

18780613 is a deficient number, since it is larger than the sum of its proper divisors (14427).

18780613 is a wasteful number, since it uses less digits than its factorization.

18780613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14426.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 18780613 is about 4333.6604620113. The cubic root of 18780613 is about 265.8091466439.

The spelling of 18780613 in words is "eighteen million, seven hundred eighty thousand, six hundred thirteen".