18312946 has 4 divisors (see below), whose sum is σ = 27469422. Its totient is φ = 9156472.

The previous prime is 18312929. The next prime is 18312947. The reversal of 18312946 is 64921381.

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., 17015625 + 1297321 = 4125^2 + 1139^2 .

It is not an unprimeable number, because it can be changed into a prime (18312947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4578235 + ... + 4578238.

Almost surely, 2^18312946 is an apocalyptic number.

18312946 is a deficient number, since it is larger than the sum of its proper divisors (9156476).

18312946 is an equidigital number, since it uses as much as digits as its factorization.

18312946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9156475.

The product of its digits is 10368, while the sum is 34.

The square root of 18312946 is about 4279.3628030350. The cubic root of 18312946 is about 263.5842188730.

The spelling of 18312946 in words is "eighteen million, three hundred twelve thousand, nine hundred forty-six".