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91390 = 25131937
BaseRepresentation
bin10110010011111110
311122100211
4112103332
510411030
61543034
7530305
oct262376
9148324
1091390
1162732
1244a7a
13327a0
142543c
151c12a
hex164fe

91390 has 32 divisors (see below), whose sum is σ = 191520. Its totient is φ = 31104.

The previous prime is 91387. The next prime is 91393. The reversal of 91390 is 9319.

91390 is a nontrivial binomial coefficient, being equal to C(40, 4).

It is an interprime number because it is at equal distance from previous prime (91387) and next prime (91393).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91393) 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, 2452 + ... + 2488.

It is an arithmetic number, because the mean of its divisors is an integer number (5985).

291390 is an apocalyptic number.

91390 is the 247-th pentagonal number.

91390 is an abundant number, since it is smaller than the sum of its proper divisors (100130).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95760).

91390 is a wasteful number, since it uses less digits than its factorization.

91390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76.

The product of its (nonzero) digits is 243, while the sum is 22.

The square root of 91390 is about 302.3077901742. The cubic root of 91390 is about 45.0435791823.

The spelling of 91390 in words is "ninety-one thousand, three hundred ninety".

Divisors: 1 2 5 10 13 19 26 37 38 65 74 95 130 185 190 247 370 481 494 703 962 1235 1406 2405 2470 3515 4810 7030 9139 18278 45695 91390