90140186 has 4 divisors (see below), whose sum is σ = 135210282. Its totient is φ = 45070092.

The previous prime is 90140159. The next prime is 90140189. The reversal of 90140186 is 68104109.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 88266025 + 1874161 = 9395^2 + 1369^2 .

It is a super-2 number, since 2×90140186² = 16250506264229192, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (90140189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22535045 + ... + 22535048.

Almost surely, 2^90140186 is an apocalyptic number.

90140186 is a deficient number, since it is larger than the sum of its proper divisors (45070096).

90140186 is a wasteful number, since it uses less digits than its factorization.

90140186 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45070095.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 90140186 is about 9494.2185565743. The cubic root of 90140186 is about 448.3730318061.

The spelling of 90140186 in words is "ninety million, one hundred forty thousand, one hundred eighty-six".