3998723723 has 4 divisors (see below), whose sum is σ = 3999029688. Its totient is φ = 3998417760.

The previous prime is 3998723699. The next prime is 3998723777. The reversal of 3998723723 is 3273278993.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3998723723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3998723023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132461 + ... + 159822.

It is an arithmetic number, because the mean of its divisors is an integer number (999757422).

Almost surely, 2^3998723723 is an apocalyptic number.

3998723723 is a deficient number, since it is larger than the sum of its proper divisors (305965).

3998723723 is a wasteful number, since it uses less digits than its factorization.

3998723723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305964.

The product of its digits is 3429216, while the sum is 53.

The square root of 3998723723 is about 63235.4625427853. The cubic root of 3998723723 is about 1587.2322037211.

The spelling of 3998723723 in words is "three billion, nine hundred ninety-eight million, seven hundred twenty-three thousand, seven hundred twenty-three".