185139489 has 8 divisors (see below), whose sum is σ = 257585472. Its totient is φ = 118059920.

The previous prime is 185139473. The next prime is 185139499. The reversal of 185139489 is 984931581.

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

It is not a de Polignac number, because 185139489 - 2⁴ = 185139473 is a prime.

It is a super-2 number, since 2×185139489² = 68553260774362242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (185139499) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1341522 + ... + 1341659.

It is an arithmetic number, because the mean of its divisors is an integer number (32198184).

Almost surely, 2^185139489 is an apocalyptic number.

It is an amenable number.

185139489 is a deficient number, since it is larger than the sum of its proper divisors (72445983).

185139489 is a wasteful number, since it uses less digits than its factorization.

185139489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2683207.

The product of its digits is 311040, while the sum is 48.

The square root of 185139489 is about 13606.5972601529. The cubic root of 185139489 is about 569.9450947422.

The spelling of 185139489 in words is "one hundred eighty-five million, one hundred thirty-nine thousand, four hundred eighty-nine".