3990947 has 4 divisors (see below), whose sum is σ = 4020216. Its totient is φ = 3961680.

The previous prime is 3990929. The next prime is 3990967. The reversal of 3990947 is 7490993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7490993 = 397 ⋅18869.

It is a cyclic number.

It is not a de Polignac number, because 3990947 - 2¹⁴ = 3974563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3990907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14429 + ... + 14702.

It is an arithmetic number, because the mean of its divisors is an integer number (1005054).

Almost surely, 2^3990947 is an apocalyptic number.

3990947 is a deficient number, since it is larger than the sum of its proper divisors (29269).

3990947 is a wasteful number, since it uses less digits than its factorization.

3990947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29268.

The product of its (nonzero) digits is 61236, while the sum is 41.

The square root of 3990947 is about 1997.7354679737. The cubic root of 3990947 is about 158.6202585560.

The spelling of 3990947 in words is "three million, nine hundred ninety thousand, nine hundred forty-seven".