1925388921 has 8 divisors (see below), whose sum is σ = 2702300320. Its totient is φ = 1216035072.

The previous prime is 1925388919. The next prime is 1925388947. The reversal of 1925388921 is 1298835291.

1925388921 is digitally balanced in base 4, 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 not a de Polignac number, because 1925388921 - 2¹ = 1925388919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1925388911) 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, 16889320 + ... + 16889433.

It is an arithmetic number, because the mean of its divisors is an integer number (337787540).

Almost surely, 2^1925388921 is an apocalyptic number.

It is an amenable number.

1925388921 is a deficient number, since it is larger than the sum of its proper divisors (776911399).

1925388921 is a wasteful number, since it uses less digits than its factorization.

1925388921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33778775.

The product of its digits is 311040, while the sum is 48.

The square root of 1925388921 is about 43879.2538792537. The cubic root of 1925388921 is about 1244.0547377289.

The spelling of 1925388921 in words is "one billion, nine hundred twenty-five million, three hundred eighty-eight thousand, nine hundred twenty-one".