2151889838 has 32 divisors (see below), whose sum is σ = 3783907008. Its totient is φ = 898560000.

The previous prime is 2151889837. The next prime is 2151889889. The reversal of 2151889838 is 8389881512.

It is a self number, because there is not a number n which added to its sum of digits gives 2151889838.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151889837) 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, 535838 + ... + 539838.

It is an arithmetic number, because the mean of its divisors is an integer number (118247094).

Almost surely, 2^2151889838 is an apocalyptic number.

2151889838 is a deficient number, since it is larger than the sum of its proper divisors (1632017170).

2151889838 is a wasteful number, since it uses less digits than its factorization.

2151889838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4988.

The product of its digits is 1105920, while the sum is 53.

The square root of 2151889838 is about 46388.4666485108. The cubic root of 2151889838 is about 1291.0409317502.

The spelling of 2151889838 in words is "two billion, one hundred fifty-one million, eight hundred eighty-nine thousand, eight hundred thirty-eight".