3990717870 has 32 divisors (see below), whose sum is σ = 10141119648. Its totient is φ = 1001591808.

The previous prime is 3990717859. The next prime is 3990717881. The reversal of 3990717870 is 787170993.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (3990717859) and next prime (3990717881).

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3911959 + ... + 3912978.

It is an arithmetic number, because the mean of its divisors is an integer number (316909989).

Almost surely, 2^3990717870 is an apocalyptic number.

3990717870 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

3990717870 is an abundant number, since it is smaller than the sum of its proper divisors (6150401778).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3990717870 is a wasteful number, since it uses less digits than its factorization.

3990717870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7824964.

The product of its (nonzero) digits is 666792, while the sum is 51.

The square root of 3990717870 is about 63172.1289019137. The cubic root of 3990717870 is about 1586.1722290591.

The spelling of 3990717870 in words is "three billion, nine hundred ninety million, seven hundred seventeen thousand, eight hundred seventy".