904139 has 4 divisors (see below), whose sum is σ = 923424. Its totient is φ = 884856.

The previous prime is 904121. The next prime is 904147. The reversal of 904139 is 931409.

It is a happy number.

904139 is an esthetic number in base 16, because in such base its adjacent digits differ by 1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 931409 = 61 ⋅15269.

It is a cyclic number.

It is not a de Polignac number, because 904139 - 2⁸ = 903883 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (900139) by changing a digit.

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, 9572 + ... + 9665.

It is an arithmetic number, because the mean of its divisors is an integer number (230856).

2⁹⁰⁴¹³⁹ is an apocalyptic number.

904139 is a deficient number, since it is larger than the sum of its proper divisors (19285).

904139 is a wasteful number, since it uses less digits than its factorization.

904139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19284.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 904139 is about 950.8622402851. The cubic root of 904139 is about 96.6967180976.

The spelling of 904139 in words is "nine hundred four thousand, one hundred thirty-nine".