166387439 has 2 divisors, whose sum is σ = 166387440. Its totient is φ = 166387438.

The previous prime is 166387391. The next prime is 166387453. The reversal of 166387439 is 934783661.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166387439 - 2⁸ = 166387183 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 166387393 and 166387402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166387469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83193719 + 83193720.

It is an arithmetic number, because the mean of its divisors is an integer number (83193720).

Almost surely, 2^166387439 is an apocalyptic number.

166387439 is a deficient number, since it is larger than the sum of its proper divisors (1).

166387439 is an equidigital number, since it uses as much as digits as its factorization.

166387439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 47.

The square root of 166387439 is about 12899.1255129951. The cubic root of 166387439 is about 550.0137065455.

The spelling of 166387439 in words is "one hundred sixty-six million, three hundred eighty-seven thousand, four hundred thirty-nine".