921425 has 6 divisors (see below), whose sum is σ = 1142598. Its totient is φ = 737120.

The previous prime is 921409. The next prime is 921457. The reversal of 921425 is 524129.

921425 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 82369 + 839056 = 287^2 + 916^2 .

It is not a de Polignac number, because 921425 - 2⁴ = 921409 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 921425.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 921425.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18404 + ... + 18453.

It is an arithmetic number, because the mean of its divisors is an integer number (190433).

2⁹²¹⁴²⁵ is an apocalyptic number.

It is an amenable number.

921425 is a deficient number, since it is larger than the sum of its proper divisors (221173).

921425 is a wasteful number, since it uses less digits than its factorization.

921425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36867 (or 36862 counting only the distinct ones).

The product of its digits is 720, while the sum is 23.

The square root of 921425 is about 959.9088498394. The cubic root of 921425 is about 97.3090719018.

The spelling of 921425 in words is "nine hundred twenty-one thousand, four hundred twenty-five".