91402387 has 8 divisors (see below), whose sum is σ = 98420400. Its totient is φ = 84566784.

The previous prime is 91402379. The next prime is 91402393. The reversal of 91402387 is 78320419.

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

It is a cyclic number.

It is not a de Polignac number, because 91402387 - 2³ = 91402379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91402187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44562 + ... + 46567.

It is an arithmetic number, because the mean of its divisors is an integer number (12302550).

Almost surely, 2^91402387 is an apocalyptic number.

91402387 is a deficient number, since it is larger than the sum of its proper divisors (7018013).

91402387 is a wasteful number, since it uses less digits than its factorization.

91402387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91205.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 91402387 is about 9560.4595600839. The cubic root of 91402387 is about 450.4561415920.

The spelling of 91402387 in words is "ninety-one million, four hundred two thousand, three hundred eighty-seven".