16977645 has 24 divisors (see below), whose sum is σ = 31160376. Its totient is φ = 8521728.

The previous prime is 16977643. The next prime is 16977671. The reversal of 16977645 is 54677961.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7851204 + 9126441 = 2802^2 + 3021^2 .

It is not a de Polignac number, because 16977645 - 2¹ = 16977643 is a prime.

It is a super-3 number, since 3×16977645³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 16977645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16977641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10332 + ... + 11861.

It is an arithmetic number, because the mean of its divisors is an integer number (1298349).

Almost surely, 2^16977645 is an apocalyptic number.

16977645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16977645 is a deficient number, since it is larger than the sum of its proper divisors (14182731).

16977645 is a wasteful number, since it uses less digits than its factorization.

16977645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22221 (or 22218 counting only the distinct ones).

The product of its digits is 317520, while the sum is 45.

The square root of 16977645 is about 4120.3937918602. The cubic root of 16977645 is about 257.0154017830.

The spelling of 16977645 in words is "sixteen million, nine hundred seventy-seven thousand, six hundred forty-five".