49139709 has 16 divisors (see below), whose sum is σ = 66912384. Its totient is φ = 32068800.

The previous prime is 49139687. The next prime is 49139723. The reversal of 49139709 is 90793194.

It is not a de Polignac number, because 49139709 - 2¹³ = 49131517 is a prime.

It is a super-2 number, since 2×49139709² = 4829422001209362, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49139749) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47619 + ... + 48639.

It is an arithmetic number, because the mean of its divisors is an integer number (4182024).

Almost surely, 2^49139709 is an apocalyptic number.

It is an amenable number.

49139709 is a deficient number, since it is larger than the sum of its proper divisors (17772675).

49139709 is a wasteful number, since it uses less digits than its factorization.

49139709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1348.

The product of its (nonzero) digits is 61236, while the sum is 42.

The square root of 49139709 is about 7009.9721112141. The cubic root of 49139709 is about 366.2780219060.

The spelling of 49139709 in words is "forty-nine million, one hundred thirty-nine thousand, seven hundred nine".