18894737 has 4 divisors (see below), whose sum is σ = 19176816. Its totient is φ = 18612660.

The previous prime is 18894713. The next prime is 18894739. The reversal of 18894737 is 73749881.

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: 73749881 = 463 ⋅159287.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18894737 is a prime.

It is a super-2 number, since 2×18894737² = 714022172598338, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18894691 and 18894700.

It is not an unprimeable number, because it can be changed into a prime (18894739) 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, 140939 + ... + 141072.

It is an arithmetic number, because the mean of its divisors is an integer number (4794204).

Almost surely, 2^18894737 is an apocalyptic number.

It is an amenable number.

18894737 is a deficient number, since it is larger than the sum of its proper divisors (282079).

18894737 is an equidigital number, since it uses as much as digits as its factorization.

18894737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282078.

The product of its digits is 338688, while the sum is 47.

The square root of 18894737 is about 4346.8076792055. The cubic root of 18894737 is about 266.3464731546.

The spelling of 18894737 in words is "eighteen million, eight hundred ninety-four thousand, seven hundred thirty-seven".