425981 has 8 divisors (see below), whose sum is σ = 453720. Its totient is φ = 399168.

The previous prime is 425977. The next prime is 425987. The reversal of 425981 is 189524.

It can be written as a sum of positive squares in 4 ways, for example, as 184900 + 241081 = 430^2 + 491^2 .

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 425981 - 2² = 425977 is a prime.

It is a super-2 number, since 2×425981² = 362919624722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (425987) 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, 875 + ... + 1271.

It is an arithmetic number, because the mean of its divisors is an integer number (56715).

425981 is a Friedman number, since it can be written as 8^5*(9+4)-2-1, using all its digits and the basic arithmetic operations.

2⁴²⁵⁹⁸¹ is an apocalyptic number.

It is an amenable number.

425981 is a deficient number, since it is larger than the sum of its proper divisors (27739).

425981 is a wasteful number, since it uses less digits than its factorization.

425981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463.

The product of its digits is 2880, while the sum is 29.

The square root of 425981 is about 652.6721994999. The cubic root of 425981 is about 75.2425333739.

The spelling of 425981 in words is "four hundred twenty-five thousand, nine hundred eighty-one".