17872139 has 2 divisors, whose sum is σ = 17872140. Its totient is φ = 17872138.

The previous prime is 17872087. The next prime is 17872157. The reversal of 17872139 is 93127871.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 17872139 - 2⁸ = 17871883 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (17872159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8936069 + 8936070.

It is an arithmetic number, because the mean of its divisors is an integer number (8936070).

Almost surely, 2^17872139 is an apocalyptic number.

17872139 is a deficient number, since it is larger than the sum of its proper divisors (1).

17872139 is an equidigital number, since it uses as much as digits as its factorization.

17872139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168, while the sum is 38.

The square root of 17872139 is about 4227.5452688292. The cubic root of 17872139 is about 261.4521261102.

The spelling of 17872139 in words is "seventeen million, eight hundred seventy-two thousand, one hundred thirty-nine".