2605994921 has 8 divisors (see below), whose sum is σ = 2740060224. Its totient is φ = 2473659760.

The previous prime is 2605994903. The next prime is 2605994927. The reversal of 2605994921 is 1294995062.

It is a happy number.

2605994921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2605994921 - 2⁶ = 2605994857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2605994927) 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, 429446 + ... + 435471.

It is an arithmetic number, because the mean of its divisors is an integer number (342507528).

Almost surely, 2^2605994921 is an apocalyptic number.

It is an amenable number.

2605994921 is a deficient number, since it is larger than the sum of its proper divisors (134065303).

2605994921 is a wasteful number, since it uses less digits than its factorization.

2605994921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 865071.

The product of its (nonzero) digits is 349920, while the sum is 47.

The square root of 2605994921 is about 51048.9463260506. The cubic root of 2605994921 is about 1376.1249057407.

The spelling of 2605994921 in words is "two billion, six hundred five million, nine hundred ninety-four thousand, nine hundred twenty-one".