425440431 has 30 divisors (see below), whose sum is σ = 688204440. Its totient is φ = 261801072.

The previous prime is 425440427. The next prime is 425440439. The reversal of 425440431 is 134044524.

It is a happy number.

425440431 is a `hidden beast` number, since 4 + 254 + 404 + 3 + 1 = 666.

It is not a de Polignac number, because 425440431 - 2² = 425440427 is a prime.

It is a super-2 number, since 2×425440431² = 361999120658931522, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 425440395 and 425440404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (425440439) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 1851 + ... + 29228.

It is an arithmetic number, because the mean of its divisors is an integer number (22940148).

Almost surely, 2^425440431 is an apocalyptic number.

425440431 is a deficient number, since it is larger than the sum of its proper divisors (262764009).

425440431 is a wasteful number, since it uses less digits than its factorization.

425440431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31117 (or 31095 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

The square root of 425440431 is about 20626.2073828419. The cubic root of 425440431 is about 752.1069236213.

Adding to 425440431 its reverse (134044524), we get a palindrome (559484955).

The spelling of 425440431 in words is "four hundred twenty-five million, four hundred forty thousand, four hundred thirty-one".