890542138 has 8 divisors (see below), whose sum is σ = 1336360788. Its totient is φ = 445088544.

The previous prime is 890542117. The next prime is 890542153. The reversal of 890542138 is 831245098.

It can be written as a sum of positive squares in 2 ways, for example, as 786970809 + 103571329 = 28053^2 + 10177^2 .

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

It is a super-2 number, since 2×890542138² = 1586130599107222088, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 890542138.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 85081 + ... + 94972.

Almost surely, 2^890542138 is an apocalyptic number.

890542138 is a deficient number, since it is larger than the sum of its proper divisors (445818650).

890542138 is a wasteful number, since it uses less digits than its factorization.

890542138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182528.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 890542138 is about 29841.9526505891. The cubic root of 890542138 is about 962.0954438119.

The spelling of 890542138 in words is "eight hundred ninety million, five hundred forty-two thousand, one hundred thirty-eight".