16721674 has 8 divisors (see below), whose sum is σ = 25251300. Its totient is φ = 8304576.

The previous prime is 16721671. The next prime is 16721687. The reversal of 16721674 is 47612761.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 11269449 + 5452225 = 3357^2 + 2335^2 .

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

It is a super-2 number, since 2×16721674² = 559228762724552, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (16721671) 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, 27759 + ... + 28354.

Almost surely, 2^16721674 is an apocalyptic number.

16721674 is a deficient number, since it is larger than the sum of its proper divisors (8529626).

16721674 is a wasteful number, since it uses less digits than its factorization.

16721674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56264.

The product of its digits is 14112, while the sum is 34.

The square root of 16721674 is about 4089.2143499699. The cubic root of 16721674 is about 255.7171864588.

The spelling of 16721674 in words is "sixteen million, seven hundred twenty-one thousand, six hundred seventy-four".