905874021 has 24 divisors (see below), whose sum is σ = 1470408576. Its totient is φ = 533221920.

The previous prime is 905874017. The next prime is 905874029. The reversal of 905874021 is 120478509.

It is not a de Polignac number, because 905874021 - 2² = 905874017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (905874029) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 165625 + ... + 171006.

It is an arithmetic number, because the mean of its divisors is an integer number (61267024).

Almost surely, 2^905874021 is an apocalyptic number.

It is an amenable number.

905874021 is a deficient number, since it is larger than the sum of its proper divisors (564534555).

905874021 is a wasteful number, since it uses less digits than its factorization.

905874021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336673 (or 336670 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 905874021 is about 30097.7411278654. The cubic root of 905874021 is about 967.5853146729.

The spelling of 905874021 in words is "nine hundred five million, eight hundred seventy-four thousand, twenty-one".