16005977 has 4 divisors (see below), whose sum is σ = 17237220. Its totient is φ = 14774736.

The previous prime is 16005967. The next prime is 16006009. The reversal of 16005977 is 77950061.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4096576 + 11909401 = 2024^2 + 3451^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16005977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16005967) 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, 615602 + ... + 615627.

It is an arithmetic number, because the mean of its divisors is an integer number (4309305).

Almost surely, 2^16005977 is an apocalyptic number.

It is an amenable number.

16005977 is a deficient number, since it is larger than the sum of its proper divisors (1231243).

16005977 is a wasteful number, since it uses less digits than its factorization.

16005977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1231242.

The product of its (nonzero) digits is 13230, while the sum is 35.

The square root of 16005977 is about 4000.7470552386. The cubic root of 16005977 is about 252.0155833565.

The spelling of 16005977 in words is "sixteen million, five thousand, nine hundred seventy-seven".