3990719969 has 4 divisors (see below), whose sum is σ = 3991975344. Its totient is φ = 3989464596.

The previous prime is 3990719951. The next prime is 3990719987. The reversal of 3990719969 is 9699170993.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9699170993 = 15233 ⋅636721.

It is an interprime number because it is at equal distance from previous prime (3990719951) and next prime (3990719987).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3990719969 is a prime.

It is a super-2 number, since 2×3990719969² = 31851691741950721922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3990719669) 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, 622907 + ... + 629280.

It is an arithmetic number, because the mean of its divisors is an integer number (997993836).

Almost surely, 2^3990719969 is an apocalyptic number.

It is an amenable number.

3990719969 is a deficient number, since it is larger than the sum of its proper divisors (1255375).

3990719969 is a wasteful number, since it uses less digits than its factorization.

3990719969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1255374.

The product of its (nonzero) digits is 7440174, while the sum is 62.

The square root of 3990719969 is about 63172.1455152506. The cubic root of 3990719969 is about 1586.1725071523.

The spelling of 3990719969 in words is "three billion, nine hundred ninety million, seven hundred nineteen thousand, nine hundred sixty-nine".