90189138 has 16 divisors (see below), whose sum is σ = 194253696. Its totient is φ = 27750480.

The previous prime is 90189083. The next prime is 90189157. The reversal of 90189138 is 83198109.

It is a happy number.

It is a super-2 number, since 2×90189138² = 16268161226366088, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 90189096 and 90189105.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 578058 + ... + 578213.

It is an arithmetic number, because the mean of its divisors is an integer number (12140856).

Almost surely, 2^90189138 is an apocalyptic number.

90189138 is an abundant number, since it is smaller than the sum of its proper divisors (104064558).

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

90189138 is a wasteful number, since it uses less digits than its factorization.

90189138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1156289.

The product of its (nonzero) digits is 15552, while the sum is 39.

The square root of 90189138 is about 9496.7961966128. The cubic root of 90189138 is about 448.4541823843.

The spelling of 90189138 in words is "ninety million, one hundred eighty-nine thousand, one hundred thirty-eight".