422723987 has 4 divisors (see below), whose sum is σ = 483113136. Its totient is φ = 362334840.

The previous prime is 422723911. The next prime is 422723999. The reversal of 422723987 is 789327224.

It is a happy number.

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

It is not a de Polignac number, because 422723987 - 2¹⁸ = 422461843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (422773987) 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, 30194564 + ... + 30194577.

It is an arithmetic number, because the mean of its divisors is an integer number (120778284).

Almost surely, 2^422723987 is an apocalyptic number.

422723987 is a deficient number, since it is larger than the sum of its proper divisors (60389149).

422723987 is an equidigital number, since it uses as much as digits as its factorization.

422723987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60389148.

The product of its digits is 338688, while the sum is 44.

The square root of 422723987 is about 20560.2526005883. The cubic root of 422723987 is about 750.5027663002.

The spelling of 422723987 in words is "four hundred twenty-two million, seven hundred twenty-three thousand, nine hundred eighty-seven".