18912894739 has 4 divisors (see below), whose sum is σ = 18913185720. Its totient is φ = 18912603760.

The previous prime is 18912894731. The next prime is 18912894787. The reversal of 18912894739 is 93749821981.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18912894739 - 2³ = 18912894731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18912894731) 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, 1524 + ... + 194494.

It is an arithmetic number, because the mean of its divisors is an integer number (4728296430).

Almost surely, 2^18912894739 is an apocalyptic number.

18912894739 is a deficient number, since it is larger than the sum of its proper divisors (290981).

18912894739 is an equidigital number, since it uses as much as digits as its factorization.

18912894739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290980.

The product of its digits is 7838208, while the sum is 61.

The spelling of 18912894739 in words is "eighteen billion, nine hundred twelve million, eight hundred ninety-four thousand, seven hundred thirty-nine".