425991 has 8 divisors (see below), whose sum is σ = 572400. Its totient is φ = 281792.

The previous prime is 425989. The next prime is 426007. The reversal of 425991 is 199524.

It is a happy number.

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 425991 - 2¹ = 425989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (425911) 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, 30 + ... + 923.

It is an arithmetic number, because the mean of its divisors is an integer number (71550).

2⁴²⁵⁹⁹¹ is an apocalyptic number.

425991 is a deficient number, since it is larger than the sum of its proper divisors (146409).

425991 is a wasteful number, since it uses less digits than its factorization.

425991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1105.

The product of its digits is 3240, while the sum is 30.

The square root of 425991 is about 652.6798602684. The cubic root of 425991 is about 75.2431221478.

The spelling of 425991 in words is "four hundred twenty-five thousand, nine hundred ninety-one".