423453981 has 16 divisors (see below), whose sum is σ = 581588480. Its totient is φ = 273898800.

The previous prime is 423453971. The next prime is 423454013. The reversal of 423453981 is 189354324.

It is not a de Polignac number, because 423453981 - 2¹⁰ = 423452957 is a prime.

It is a super-2 number, since 2×423453981² = 358626548049496722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423453971) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8610 + ... + 30348.

It is an arithmetic number, because the mean of its divisors is an integer number (36349280).

Almost surely, 2^423453981 is an apocalyptic number.

It is an amenable number.

423453981 is a deficient number, since it is larger than the sum of its proper divisors (158134499).

423453981 is a wasteful number, since it uses less digits than its factorization.

423453981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21936.

The product of its digits is 103680, while the sum is 39.

The square root of 423453981 is about 20577.9974973271. The cubic root of 423453981 is about 750.9345275052.

The spelling of 423453981 in words is "four hundred twenty-three million, four hundred fifty-three thousand, nine hundred eighty-one".