425831987 has 4 divisors (see below), whose sum is σ = 486665136. Its totient is φ = 364998840.

The previous prime is 425831977. The next prime is 425831993. The reversal of 425831987 is 789138524.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 425831987 - 2¹⁰ = 425830963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (425831947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30416564 + ... + 30416577.

It is an arithmetic number, because the mean of its divisors is an integer number (121666284).

Almost surely, 2^425831987 is an apocalyptic number.

425831987 is a deficient number, since it is larger than the sum of its proper divisors (60833149).

425831987 is an equidigital number, since it uses as much as digits as its factorization.

425831987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60833148.

The product of its digits is 483840, while the sum is 47.

The square root of 425831987 is about 20635.6969109357. The cubic root of 425831987 is about 752.3375878598.

The spelling of 425831987 in words is "four hundred twenty-five million, eight hundred thirty-one thousand, nine hundred eighty-seven".