423981958 has 4 divisors (see below), whose sum is σ = 635972940. Its totient is φ = 211990978.

The previous prime is 423981953. The next prime is 423981959. The reversal of 423981958 is 859189324.

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

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423981953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105995488 + ... + 105995491.

It is an arithmetic number, because the mean of its divisors is an integer number (158993235).

Almost surely, 2^423981958 is an apocalyptic number.

423981958 is a deficient number, since it is larger than the sum of its proper divisors (211990982).

423981958 is a wasteful number, since it uses less digits than its factorization.

423981958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211990981.

The product of its digits is 622080, while the sum is 49.

The square root of 423981958 is about 20590.8221788252. The cubic root of 423981958 is about 751.2464948900.

The spelling of 423981958 in words is "four hundred twenty-three million, nine hundred eighty-one thousand, nine hundred fifty-eight".