18879705 has 48 divisors (see below), whose sum is σ = 35904960. Its totient is φ = 9120384.

The previous prime is 18879703. The next prime is 18879733. The reversal of 18879705 is 50797881.

It is not a de Polignac number, because 18879705 - 2¹ = 18879703 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

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

It is not an unprimeable number, because it can be changed into a prime (18879703) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 34242 + ... + 34788.

It is an arithmetic number, because the mean of its divisors is an integer number (748020).

Almost surely, 2^18879705 is an apocalyptic number.

18879705 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18879705 is a deficient number, since it is larger than the sum of its proper divisors (17025255).

18879705 is a wasteful number, since it uses less digits than its factorization.

18879705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630 (or 627 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 45.

The square root of 18879705 is about 4345.0782501584. The cubic root of 18879705 is about 266.2758223980.

The spelling of 18879705 in words is "eighteen million, eight hundred seventy-nine thousand, seven hundred five".