91840438 has 8 divisors (see below), whose sum is σ = 141484032. Its totient is φ = 44679096.

The previous prime is 91840421. The next prime is 91840439. The reversal of 91840438 is 83404819.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a junction number, because it is equal to n+sod(n) for n = 91840397 and 91840406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91840439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 620470 + ... + 620617.

It is an arithmetic number, because the mean of its divisors is an integer number (17685504).

Almost surely, 2^91840438 is an apocalyptic number.

91840438 is a deficient number, since it is larger than the sum of its proper divisors (49643594).

91840438 is a wasteful number, since it uses less digits than its factorization.

91840438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1241126.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 91840438 is about 9583.3416927500. The cubic root of 91840438 is about 451.1746070487.

The spelling of 91840438 in words is "ninety-one million, eight hundred forty thousand, four hundred thirty-eight".