91738439 has 6 divisors (see below), whose sum is σ = 99338256. Its totient is φ = 84681480.

The previous prime is 91738399. The next prime is 91738447. The reversal of 91738439 is 93483719.

It is a happy number.

It is not a de Polignac number, because 91738439 - 2⁸ = 91738183 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91738439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91738499) 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, 271247 + ... + 271584.

It is an arithmetic number, because the mean of its divisors is an integer number (16556376).

Almost surely, 2^91738439 is an apocalyptic number.

91738439 is a deficient number, since it is larger than the sum of its proper divisors (7599817).

91738439 is a wasteful number, since it uses less digits than its factorization.

91738439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542857 (or 542844 counting only the distinct ones).

The product of its digits is 163296, while the sum is 44.

The square root of 91738439 is about 9578.0185320347. The cubic root of 91738439 is about 451.0075186840.

The spelling of 91738439 in words is "ninety-one million, seven hundred thirty-eight thousand, four hundred thirty-nine".