18947954 has 4 divisors (see below), whose sum is σ = 28421934. Its totient is φ = 9473976.

The previous prime is 18947927. The next prime is 18947963. The reversal of 18947954 is 45974981.

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

It can be written as a sum of positive squares in only one way, i.e., 17447329 + 1500625 = 4177^2 + 1225^2 .

It is a super-2 number, since 2×18947954² = 718049921572232, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18947899 and 18947908.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4736987 + ... + 4736990.

Almost surely, 2^18947954 is an apocalyptic number.

18947954 is a deficient number, since it is larger than the sum of its proper divisors (9473980).

18947954 is an equidigital number, since it uses as much as digits as its factorization.

18947954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9473979.

The product of its digits is 362880, while the sum is 47.

The square root of 18947954 is about 4352.9247638800. The cubic root of 18947954 is about 266.5962935830.

The spelling of 18947954 in words is "eighteen million, nine hundred forty-seven thousand, nine hundred fifty-four".