425869721 has 4 divisors (see below), whose sum is σ = 435773712. Its totient is φ = 415965732.

The previous prime is 425869699. The next prime is 425869733. The reversal of 425869721 is 127968524.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-425869721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (425869421) 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, 4951931 + ... + 4952016.

It is an arithmetic number, because the mean of its divisors is an integer number (108943428).

Almost surely, 2^425869721 is an apocalyptic number.

It is an amenable number.

425869721 is a deficient number, since it is larger than the sum of its proper divisors (9903991).

425869721 is an equidigital number, since it uses as much as digits as its factorization.

425869721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9903990.

The product of its digits is 241920, while the sum is 44.

The square root of 425869721 is about 20636.6111801332. The cubic root of 425869721 is about 752.3598093532.

The spelling of 425869721 in words is "four hundred twenty-five million, eight hundred sixty-nine thousand, seven hundred twenty-one".