84090381 has 16 divisors (see below), whose sum is σ = 121927104. Its totient is φ = 51335424.

The previous prime is 84090373. The next prime is 84090389. The reversal of 84090381 is 18309048.

It is an interprime number because it is at equal distance from previous prime (84090373) and next prime (84090389).

It is not a de Polignac number, because 84090381 - 2³ = 84090373 is a prime.

It is a super-2 number, since 2×84090381² = 14142384353450322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84090389) 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, 20395 + ... + 24168.

It is an arithmetic number, because the mean of its divisors is an integer number (7620444).

Almost surely, 2^84090381 is an apocalyptic number.

It is an amenable number.

84090381 is a deficient number, since it is larger than the sum of its proper divisors (37836723).

84090381 is a wasteful number, since it uses less digits than its factorization.

84090381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44620.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 84090381 is about 9170.0807520981. The cubic root of 84090381 is about 438.1089312267.

The spelling of 84090381 in words is "eighty-four million, ninety thousand, three hundred eighty-one".