18742793 has 4 divisors (see below), whose sum is σ = 19006848. Its totient is φ = 18478740.

The previous prime is 18742741. The next prime is 18742819. The reversal of 18742793 is 39724781.

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, and also an emirpimes, since its reverse is a distinct semiprime: 39724781 = 547 ⋅72623.

It is a cyclic number.

It is not a de Polignac number, because 18742793 - 2¹⁶ = 18677257 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 18742793.

It is not an unprimeable number, because it can be changed into a prime (18742193) 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, 131921 + ... + 132062.

It is an arithmetic number, because the mean of its divisors is an integer number (4751712).

Almost surely, 2^18742793 is an apocalyptic number.

It is an amenable number.

18742793 is a deficient number, since it is larger than the sum of its proper divisors (264055).

18742793 is an equidigital number, since it uses as much as digits as its factorization.

18742793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264054.

The product of its digits is 84672, while the sum is 41.

The square root of 18742793 is about 4329.2947462606. The cubic root of 18742793 is about 265.6305997989.

The spelling of 18742793 in words is "eighteen million, seven hundred forty-two thousand, seven hundred ninety-three".