3999999997 has 6 divisors (see below), whose sum is σ = 4653061278. Its totient is φ = 3428571384.

The previous prime is 3999999979. The next prime is 4000000007. The reversal of 3999999997 is 7999999993.

It can be written as a sum of positive squares in only one way, i.e., 3992849721 + 7150276 = 63189^2 + 2674^2 .

It is not a de Polignac number, because 3999999997 - 2⁷ = 3999999869 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3999999997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3999999937) 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, 40816278 + ... + 40816375.

It is an arithmetic number, because the mean of its divisors is an integer number (775510213).

Almost surely, 2^3999999997 is an apocalyptic number.

It is an amenable number.

3999999997 is a deficient number, since it is larger than the sum of its proper divisors (653061281).

3999999997 is an equidigital number, since it uses as much as digits as its factorization.

3999999997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81632667 (or 81632660 counting only the distinct ones).

The product of its digits is 903981141, while the sum is 82.

The square root of 3999999997 is about 63245.5531796505. The cubic root of 3999999997 is about 1587.4010515713.

It can be divided in two parts, 3 and 999999997, that added together give a 9-th power (1000000000 = 10⁹).

The spelling of 3999999997 in words is "three billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-seven".