3991455423 has 12 divisors (see below), whose sum is σ = 5766117448. Its totient is φ = 2660655600.

The previous prime is 3991455421. The next prime is 3991455439. The reversal of 3991455423 is 3245541993.

3991455423 is a `hidden beast` number, since 3 + 9 + 91 + 4 + 554 + 2 + 3 = 666.

It is not a de Polignac number, because 3991455423 - 2¹ = 3991455421 is a prime.

It is a super-2 number, since 2×3991455423² = 31863432787592217858, which contains 22 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 (3991455421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 74448 + ... + 116298.

Almost surely, 2^3991455423 is an apocalyptic number.

3991455423 is a deficient number, since it is larger than the sum of its proper divisors (1774662025).

3991455423 is a wasteful number, since it uses less digits than its factorization.

3991455423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52454 (or 52451 counting only the distinct ones).

The product of its digits is 583200, while the sum is 45.

The square root of 3991455423 is about 63177.9662778092. The cubic root of 3991455423 is about 1586.2699403030.

The spelling of 3991455423 in words is "three billion, nine hundred ninety-one million, four hundred fifty-five thousand, four hundred twenty-three".