3999777999 has 32 divisors (see below), whose sum is σ = 6294013440. Its totient is φ = 2211898752.

The previous prime is 3999777997. The next prime is 3999778019. The reversal of 3999777999 is 9997779993.

It is not a de Polignac number, because 3999777999 - 2¹ = 3999777997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3999777997) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 78109 + ... + 118745.

It is an arithmetic number, because the mean of its divisors is an integer number (196687920).

Almost surely, 2^3999777999 is an apocalyptic number.

3999777999 is a deficient number, since it is larger than the sum of its proper divisors (2294235441).

3999777999 is a wasteful number, since it uses less digits than its factorization.

3999777999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40799.

The product of its digits is 546852789, while the sum is 78.

The square root of 3999777999 is about 63243.7981070081. The cubic root of 3999777999 is about 1587.3716843731.

The spelling of 3999777999 in words is "three billion, nine hundred ninety-nine million, seven hundred seventy-seven thousand, nine hundred ninety-nine".