2149905690 has 24 divisors (see below), whose sum is σ = 5589755028. Its totient is φ = 573308160.

The previous prime is 2149905673. The next prime is 2149905767. The reversal of 2149905690 is 965099412.

2149905690 is a `hidden beast` number, since 21 + 499 + 0 + 56 + 90 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2001041289 + 148864401 = 44733^2 + 12201^2 .

It is a super-2 number, since 2×2149905690² = 9244188951788752200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11943831 + ... + 11944010.

Almost surely, 2^2149905690 is an apocalyptic number.

2149905690 is an abundant number, since it is smaller than the sum of its proper divisors (3439849338).

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

2149905690 is a wasteful number, since it uses less digits than its factorization.

2149905690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23887854 (or 23887851 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 45.

The square root of 2149905690 is about 46367.0754954418. The cubic root of 2149905690 is about 1290.6440087056.

The spelling of 2149905690 in words is "two billion, one hundred forty-nine million, nine hundred five thousand, six hundred ninety".