17940861 has 12 divisors (see below), whose sum is σ = 26081692. Its totient is φ = 11883456.

The previous prime is 17940859. The next prime is 17940863. The reversal of 17940861 is 16804971.

It is an interprime number because it is at equal distance from previous prime (17940859) and next prime (17940863).

It can be written as a sum of positive squares in 2 ways, for example, as 4435236 + 13505625 = 2106^2 + 3675^2 .

It is not a de Polignac number, because 17940861 - 2¹ = 17940859 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17940863) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4936 + ... + 7761.

Almost surely, 2^17940861 is an apocalyptic number.

It is an amenable number.

17940861 is a deficient number, since it is larger than the sum of its proper divisors (8140831).

17940861 is a wasteful number, since it uses less digits than its factorization.

17940861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12860 (or 12857 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 17940861 is about 4235.6653550534. The cubic root of 17940861 is about 261.7868096551.

The spelling of 17940861 in words is "seventeen million, nine hundred forty thousand, eight hundred sixty-one".