3990634867 has 4 divisors (see below), whose sum is σ = 4119365056. Its totient is φ = 3861904680.

The previous prime is 3990634853. The next prime is 3990634877. The reversal of 3990634867 is 7684360993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7684360993 = 653 ⋅11767781.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3990634867 is a prime.

It is a super-2 number, since 2×3990634867² = 31850333283432215378, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3990634807) 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, 64365048 + ... + 64365109.

It is an arithmetic number, because the mean of its divisors is an integer number (1029841264).

Almost surely, 2^3990634867 is an apocalyptic number.

3990634867 is a deficient number, since it is larger than the sum of its proper divisors (128730189).

3990634867 is a wasteful number, since it uses less digits than its factorization.

3990634867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128730188.

The product of its (nonzero) digits is 5878656, while the sum is 55.

The square root of 3990634867 is about 63171.4719394760. The cubic root of 3990634867 is about 1586.1612320430.

The spelling of 3990634867 in words is "three billion, nine hundred ninety million, six hundred thirty-four thousand, eight hundred sixty-seven".