1838501649 has 6 divisors (see below), whose sum is σ = 2655613506. Its totient is φ = 1225667760.

The previous prime is 1838501629. The next prime is 1838501659. The reversal of 1838501649 is 9461058381.

1838501649 is a `hidden beast` number, since 1 + 83 + 8 + 501 + 64 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1683050625 + 155451024 = 41025^2 + 12468^2 .

It is not a de Polignac number, because 1838501649 - 2¹² = 1838497553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1838501629) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 102138972 + ... + 102138989.

It is an arithmetic number, because the mean of its divisors is an integer number (442602251).

Almost surely, 2^1838501649 is an apocalyptic number.

It is an amenable number.

1838501649 is a deficient number, since it is larger than the sum of its proper divisors (817111857).

1838501649 is a wasteful number, since it uses less digits than its factorization.

1838501649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204277967 (or 204277964 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The square root of 1838501649 is about 42877.7523781273. The cubic root of 1838501649 is about 1225.0524256891.

The spelling of 1838501649 in words is "one billion, eight hundred thirty-eight million, five hundred one thousand, six hundred forty-nine".