1982409165 has 24 divisors (see below), whose sum is σ = 3748556448. Its totient is φ = 961167840.

The previous prime is 1982409157. The next prime is 1982409181. The reversal of 1982409165 is 5619042891.

1982409165 is a `hidden beast` number, since 1 + 9 + 82 + 409 + 165 = 666.

It is not a de Polignac number, because 1982409165 - 2³ = 1982409157 is a prime.

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 1982409165.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2001939 + ... + 2002928.

It is an arithmetic number, because the mean of its divisors is an integer number (156189852).

Almost surely, 2^1982409165 is an apocalyptic number.

1982409165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1982409165 is a deficient number, since it is larger than the sum of its proper divisors (1766147283).

1982409165 is a wasteful number, since it uses less digits than its factorization.

1982409165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4004889 (or 4004886 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The square root of 1982409165 is about 44524.2536714542. The cubic root of 1982409165 is about 1256.2163231486.

The spelling of 1982409165 in words is "one billion, nine hundred eighty-two million, four hundred nine thousand, one hundred sixty-five".