2138154844 has 24 divisors (see below), whose sum is σ = 4277316960. Its totient is φ = 916136256.

The previous prime is 2138154841. The next prime is 2138154869. The reversal of 2138154844 is 4484518312.

It is a super-2 number, since 2×2138154844² = 9143412273841328672, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2138154797 and 2138154806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2138154841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186774 + ... + 197890.

It is an arithmetic number, because the mean of its divisors is an integer number (178221540).

Almost surely, 2^2138154844 is an apocalyptic number.

It is an amenable number.

2138154844 is an abundant number, since it is smaller than the sum of its proper divisors (2139162116).

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

2138154844 is a wasteful number, since it uses less digits than its factorization.

2138154844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17997 (or 17995 counting only the distinct ones).

The product of its digits is 122880, while the sum is 40.

The square root of 2138154844 is about 46240.1864615618. The cubic root of 2138154844 is about 1288.2882658865.

The spelling of 2138154844 in words is "two billion, one hundred thirty-eight million, one hundred fifty-four thousand, eight hundred forty-four".