2181902338 has 64 divisors (see below), whose sum is σ = 4187344896. Its totient is φ = 828000000.

The previous prime is 2181902323. The next prime is 2181902339. The reversal of 2181902338 is 8332091812.

It is a junction number, because it is equal to n+sod(n) for n = 2181902297 and 2181902306.

It is not an unprimeable number, because it can be changed into a prime (2181902339) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1816138 + ... + 1817338.

It is an arithmetic number, because the mean of its divisors is an integer number (65427264).

Almost surely, 2^2181902338 is an apocalyptic number.

2181902338 is a deficient number, since it is larger than the sum of its proper divisors (2005442558).

2181902338 is a wasteful number, since it uses less digits than its factorization.

2181902338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1519.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 2181902338 is about 46710.8374791118. The cubic root of 2181902338 is about 1297.0153100453.

The spelling of 2181902338 in words is "two billion, one hundred eighty-one million, nine hundred two thousand, three hundred thirty-eight".