16989977 has 4 divisors (see below), whose sum is σ = 17205120. Its totient is φ = 16774836.

The previous prime is 16989967. The next prime is 16989991. The reversal of 16989977 is 77998961.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 77998961 = 97 ⋅804113.

It is a cyclic number.

It is not a de Polignac number, because 16989977 - 2¹⁸ = 16727833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16989937) 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, 107453 + ... + 107610.

It is an arithmetic number, because the mean of its divisors is an integer number (4301280).

Almost surely, 2^16989977 is an apocalyptic number.

It is an amenable number.

16989977 is a deficient number, since it is larger than the sum of its proper divisors (215143).

16989977 is an equidigital number, since it uses as much as digits as its factorization.

16989977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215142.

The product of its digits is 1714608, while the sum is 56.

The square root of 16989977 is about 4121.8899791237. The cubic root of 16989977 is about 257.0776158855.

The spelling of 16989977 in words is "sixteen million, nine hundred eighty-nine thousand, nine hundred seventy-seven".