16447994 has 4 divisors (see below), whose sum is σ = 24671994. Its totient is φ = 8223996.

The previous prime is 16447987. The next prime is 16448051. The reversal of 16447994 is 49974461.

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., 14922769 + 1525225 = 3863^2 + 1235^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4111997 + ... + 4112000.

Almost surely, 2^16447994 is an apocalyptic number.

16447994 is a deficient number, since it is larger than the sum of its proper divisors (8224000).

16447994 is an equidigital number, since it uses as much as digits as its factorization.

16447994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8223999.

The product of its digits is 217728, while the sum is 44.

The square root of 16447994 is about 4055.6126540882. The cubic root of 16447994 is about 254.3144162659.

The spelling of 16447994 in words is "sixteen million, four hundred forty-seven thousand, nine hundred ninety-four".