18661274 has 8 divisors (see below), whose sum is σ = 29638548. Its totient is φ = 8781760.

The previous prime is 18661271. The next prime is 18661277. The reversal of 18661274 is 47216681.

It is an interprime number because it is at equal distance from previous prime (18661271) and next prime (18661277).

It can be written as a sum of positive squares in 2 ways, for example, as 17280649 + 1380625 = 4157^2 + 1175^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (18661271) 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, 274397 + ... + 274464.

Almost surely, 2^18661274 is an apocalyptic number.

18661274 is a deficient number, since it is larger than the sum of its proper divisors (10977274).

18661274 is a wasteful number, since it uses less digits than its factorization.

18661274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548880.

The product of its digits is 16128, while the sum is 35.

The square root of 18661274 is about 4319.8696739601. The cubic root of 18661274 is about 265.2449331504.

The spelling of 18661274 in words is "eighteen million, six hundred sixty-one thousand, two hundred seventy-four".