49139988 has 12 divisors (see below), whose sum is σ = 114660000. Its totient is φ = 16379992.

The previous prime is 49139977. The next prime is 49139999. The reversal of 49139988 is 88993194.

It is a happy number.

49139988 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (49139977) and next prime (49139999).

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 49139988.

It is a congruent number.

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, 2047488 + ... + 2047511.

It is an arithmetic number, because the mean of its divisors is an integer number (9555000).

Almost surely, 2^49139988 is an apocalyptic number.

It is an amenable number.

49139988 is an abundant number, since it is smaller than the sum of its proper divisors (65520012).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

49139988 is a wasteful number, since it uses less digits than its factorization.

49139988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4095006 (or 4095004 counting only the distinct ones).

The product of its digits is 559872, while the sum is 51.

The square root of 49139988 is about 7009.9920114077. The cubic root of 49139988 is about 366.2787151089.

The spelling of 49139988 in words is "forty-nine million, one hundred thirty-nine thousand, nine hundred eighty-eight".