17990977 has 4 divisors (see below), whose sum is σ = 18122436. Its totient is φ = 17859520.

The previous prime is 17990969. The next prime is 17990983. The reversal of 17990977 is 77909971.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77909971 = 1237 ⋅62983.

It can be written as a sum of positive squares in 2 ways, for example, as 4330561 + 13660416 = 2081^2 + 3696^2 .

It is a cyclic number.

It is not a de Polignac number, because 17990977 - 2³ = 17990969 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 17990977.

It is not an unprimeable number, because it can be changed into a prime (17990957) 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, 65524 + ... + 65797.

It is an arithmetic number, because the mean of its divisors is an integer number (4530609).

Almost surely, 2^17990977 is an apocalyptic number.

It is an amenable number.

17990977 is a deficient number, since it is larger than the sum of its proper divisors (131459).

17990977 is a wasteful number, since it uses less digits than its factorization.

17990977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131458.

The product of its (nonzero) digits is 250047, while the sum is 49.

The square root of 17990977 is about 4241.5771830771. The cubic root of 17990977 is about 262.0303414544.

The spelling of 17990977 in words is "seventeen million, nine hundred ninety thousand, nine hundred seventy-seven".