91238439 has 16 divisors (see below), whose sum is σ = 130260960. Its totient is φ = 56601600.

The previous prime is 91238359. The next prime is 91238449. The reversal of 91238439 is 93483219.

It is not a de Polignac number, because 91238439 - 2¹² = 91234343 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91238397 and 91238406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91238449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5512 + ... + 14589.

It is an arithmetic number, because the mean of its divisors is an integer number (8141310).

Almost surely, 2^91238439 is an apocalyptic number.

91238439 is a deficient number, since it is larger than the sum of its proper divisors (39022521).

91238439 is a wasteful number, since it uses less digits than its factorization.

91238439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20210.

The product of its digits is 46656, while the sum is 39.

The square root of 91238439 is about 9551.8814377064. The cubic root of 91238439 is about 450.1866534324.

The spelling of 91238439 in words is "ninety-one million, two hundred thirty-eight thousand, four hundred thirty-nine".