16929991 has 8 divisors (see below), whose sum is σ = 18542160. Its totient is φ = 15362112.

The previous prime is 16929971. The next prime is 16930027. The reversal of 16929991 is 19992961.

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

It is a cyclic number.

It is not a de Polignac number, because 16929991 - 2¹⁹ = 16405703 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16929901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10270 + ... + 11803.

It is an arithmetic number, because the mean of its divisors is an integer number (2317770).

Almost surely, 2^16929991 is an apocalyptic number.

16929991 is a deficient number, since it is larger than the sum of its proper divisors (1612169).

16929991 is a wasteful number, since it uses less digits than its factorization.

16929991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22145.

The product of its digits is 78732, while the sum is 46.

The square root of 16929991 is about 4114.6070286238. The cubic root of 16929991 is about 256.7747070501.

The spelling of 16929991 in words is "sixteen million, nine hundred twenty-nine thousand, nine hundred ninety-one".