8421372423 has 6 divisors (see below), whose sum is σ = 12164204624. Its totient is φ = 5614248276.

The previous prime is 8421372397. The next prime is 8421372431. The reversal of 8421372423 is 3242731248.

It is a happy number.

It is not a de Polignac number, because 8421372423 - 2¹⁸ = 8421110279 is a prime.

It is a super-4 number, since 4×8421372423⁴ (a number of 41 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8421370423) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 467854015 + ... + 467854032.

Almost surely, 2^8421372423 is an apocalyptic number.

8421372423 is a deficient number, since it is larger than the sum of its proper divisors (3742832201).

8421372423 is a wasteful number, since it uses less digits than its factorization.

8421372423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 935708053 (or 935708050 counting only the distinct ones).

The product of its digits is 64512, while the sum is 36.

The square root of 8421372423 is about 91768.0359547920. The cubic root of 8421372423 is about 2034.5152894598.

The spelling of 8421372423 in words is "eight billion, four hundred twenty-one million, three hundred seventy-two thousand, four hundred twenty-three".