18939670 has 8 divisors (see below), whose sum is σ = 34091424. Its totient is φ = 7575864.

The previous prime is 18939653. The next prime is 18939673. The reversal of 18939670 is 7693981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×18939670² = 717422199417800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18939673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 946974 + ... + 946993.

It is an arithmetic number, because the mean of its divisors is an integer number (4261428).

Almost surely, 2^18939670 is an apocalyptic number.

18939670 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18939670 is a deficient number, since it is larger than the sum of its proper divisors (15151754).

18939670 is a wasteful number, since it uses less digits than its factorization.

18939670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1893974.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 18939670 is about 4351.9731157258. The cubic root of 18939670 is about 266.5574361665.

The spelling of 18939670 in words is "eighteen million, nine hundred thirty-nine thousand, six hundred seventy".