890542139 has 4 divisors (see below), whose sum is σ = 891095856. Its totient is φ = 889988424.

The previous prime is 890542117. The next prime is 890542153. The reversal of 890542139 is 931245098.

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

It is a cyclic number.

It is not a de Polignac number, because 890542139 - 2¹² = 890538043 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 890542096 and 890542105.

It is not an unprimeable number, because it can be changed into a prime (890542189) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 274439 + ... + 277664.

It is an arithmetic number, because the mean of its divisors is an integer number (222773964).

Almost surely, 2^890542139 is an apocalyptic number.

890542139 is a deficient number, since it is larger than the sum of its proper divisors (553717).

890542139 is a wasteful number, since it uses less digits than its factorization.

890542139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553716.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 890542139 is about 29841.9526673440. The cubic root of 890542139 is about 962.0954441720.

The spelling of 890542139 in words is "eight hundred ninety million, five hundred forty-two thousand, one hundred thirty-nine".