3999249431 has 8 divisors (see below), whose sum is σ = 4040146944. Its totient is φ = 3958499160.

The previous prime is 3999249421. The next prime is 3999249467. The reversal of 3999249431 is 1349429993.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3999249431 - 2¹⁸ = 3998987287 is a prime.

It is a super-2 number, since 2×3999249431² = 31987992022707647522, 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 (3999249421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18206 + ... + 91268.

It is an arithmetic number, because the mean of its divisors is an integer number (505018368).

Almost surely, 2^3999249431 is an apocalyptic number.

3999249431 is a deficient number, since it is larger than the sum of its proper divisors (40897513).

3999249431 is a wasteful number, since it uses less digits than its factorization.

3999249431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73621.

The product of its digits is 1889568, while the sum is 53.

The square root of 3999249431 is about 63239.6191560322. The cubic root of 3999249431 is about 1587.3017579223.

The spelling of 3999249431 in words is "three billion, nine hundred ninety-nine million, two hundred forty-nine thousand, four hundred thirty-one".