17949997 has 6 divisors (see below), whose sum is σ = 19437162. Its totient is φ = 16569072.

The previous prime is 17949991. The next prime is 17950001. The reversal of 17949997 is 79994971.

It can be written as a sum of positive squares in 3 ways, for example, as 594441 + 17355556 = 771^2 + 4166^2 .

It is a de Polignac number, because none of the positive numbers 2^k-17949997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17949991) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 52938 + ... + 53275.

It is an arithmetic number, because the mean of its divisors is an integer number (3239527).

Almost surely, 2^17949997 is an apocalyptic number.

It is an amenable number.

17949997 is a deficient number, since it is larger than the sum of its proper divisors (1487165).

17949997 is a wasteful number, since it uses less digits than its factorization.

17949997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106239 (or 106226 counting only the distinct ones).

The product of its digits is 1285956, while the sum is 55.

The square root of 17949997 is about 4236.7436788175. The cubic root of 17949997 is about 261.8312385603.

It can be divided in two parts, 17949 and 997, that multiplied together give a triangular number (17895153 = T₅₉₈₂).

The spelling of 17949997 in words is "seventeen million, nine hundred forty-nine thousand, nine hundred ninety-seven".