49139989 has 4 divisors (see below), whose sum is σ = 49217056. Its totient is φ = 49062924.

The previous prime is 49139977. The next prime is 49139999. The reversal of 49139989 is 98993194.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98993194 = 2 ⋅49496597.

It is a cyclic number.

It is not a de Polignac number, because 49139989 - 2¹¹ = 49137941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49139939) 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, 37569 + ... + 38854.

It is an arithmetic number, because the mean of its divisors is an integer number (12304264).

Almost surely, 2^49139989 is an apocalyptic number.

It is an amenable number.

49139989 is a deficient number, since it is larger than the sum of its proper divisors (77067).

49139989 is an equidigital number, since it uses as much as digits as its factorization.

49139989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77066.

The product of its digits is 629856, while the sum is 52.

The square root of 49139989 is about 7009.9920827345. The cubic root of 49139989 is about 366.2787175935.

The spelling of 49139989 in words is "forty-nine million, one hundred thirty-nine thousand, nine hundred eighty-nine".