49138989 has 4 divisors (see below), whose sum is σ = 65518656. Its totient is φ = 32759324.

The previous prime is 49138987. The next prime is 49139047. The reversal of 49138989 is 98983194.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 49138989 - 2¹ = 49138987 is a prime.

It is a super-3 number, since 3×49138989³ (a number of 24 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49138987) 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, 8189829 + ... + 8189834.

It is an arithmetic number, because the mean of its divisors is an integer number (16379664).

Almost surely, 2^49138989 is an apocalyptic number.

It is an amenable number.

49138989 is a deficient number, since it is larger than the sum of its proper divisors (16379667).

49138989 is a wasteful number, since it uses less digits than its factorization.

49138989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16379666.

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

The square root of 49138989 is about 7009.9207556149. The cubic root of 49138989 is about 366.2762329830.

The spelling of 49138989 in words is "forty-nine million, one hundred thirty-eight thousand, nine hundred eighty-nine".