17939642 has 16 divisors (see below), whose sum is σ = 30904512. Its totient is φ = 7650720.

The previous prime is 17939633. The next prime is 17939657. The reversal of 17939642 is 24693971.

It is a self number, because there is not a number n which added to its sum of digits gives 17939642.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 83 + ... + 5990.

It is an arithmetic number, because the mean of its divisors is an integer number (1931532).

Almost surely, 2^17939642 is an apocalyptic number.

17939642 is a deficient number, since it is larger than the sum of its proper divisors (12964870).

17939642 is a wasteful number, since it uses less digits than its factorization.

17939642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6293.

The product of its digits is 81648, while the sum is 41.

The square root of 17939642 is about 4235.5214554999. The cubic root of 17939642 is about 261.7808804460.

It can be divided in two parts, 17939 and 642, that added together give a palindrome (18581).

The spelling of 17939642 in words is "seventeen million, nine hundred thirty-nine thousand, six hundred forty-two".