49138890 has 16 divisors (see below), whose sum is σ = 117933408. Its totient is φ = 13103696.

The previous prime is 49138867. The next prime is 49138907. The reversal of 49138890 is 9883194.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 818952 + ... + 819011.

It is an arithmetic number, because the mean of its divisors is an integer number (7370838).

Almost surely, 2^49138890 is an apocalyptic number.

49138890 is an abundant number, since it is smaller than the sum of its proper divisors (68794518).

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

49138890 is a wasteful number, since it uses less digits than its factorization.

49138890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1637973.

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 49138890 is about 7009.9136941905. The cubic root of 49138890 is about 366.2759870047.

The spelling of 49138890 in words is "forty-nine million, one hundred thirty-eight thousand, eight hundred ninety".