3990888929 has 4 divisors (see below), whose sum is σ = 3991060500. Its totient is φ = 3990717360.

The previous prime is 3990888887. The next prime is 3990888959. The reversal of 3990888929 is 9298880993.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1240096225 + 2750792704 = 35215^2 + 52448^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3990888929 is a prime.

It is a super-2 number, since 2×3990888929² = 31854388887229534082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3990888959) 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, 44162 + ... + 99659.

It is an arithmetic number, because the mean of its divisors is an integer number (997765125).

Almost surely, 2^3990888929 is an apocalyptic number.

It is an amenable number.

3990888929 is a deficient number, since it is larger than the sum of its proper divisors (171571).

3990888929 is a wasteful number, since it uses less digits than its factorization.

3990888929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171570.

The product of its (nonzero) digits is 20155392, while the sum is 65.

The square root of 3990888929 is about 63173.4827993518. The cubic root of 3990888929 is about 1586.1948920793.

The spelling of 3990888929 in words is "three billion, nine hundred ninety million, eight hundred eighty-eight thousand, nine hundred twenty-nine".