17939090 has 16 divisors (see below), whose sum is σ = 34774488. Its totient is φ = 6623616.

The previous prime is 17939071. The next prime is 17939113. The reversal of 17939090 is 9093971.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4986289 + 12952801 = 2233^2 + 3599^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68867 + ... + 69126.

Almost surely, 2^17939090 is an apocalyptic number.

17939090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

17939090 is a deficient number, since it is larger than the sum of its proper divisors (16835398).

17939090 is a wasteful number, since it uses less digits than its factorization.

17939090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138013.

The product of its (nonzero) digits is 15309, while the sum is 38.

The square root of 17939090 is about 4235.4562918297. The cubic root of 17939090 is about 261.7781954328.

The spelling of 17939090 in words is "seventeen million, nine hundred thirty-nine thousand, ninety".