3947998 has 4 divisors (see below), whose sum is σ = 5922000. Its totient is φ = 1973998.

The previous prime is 3947987. The next prime is 3948071. The reversal of 3947998 is 8997493.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8997493 = 263 ⋅34211.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 986998 + ... + 987001.

It is an arithmetic number, because the mean of its divisors is an integer number (1480500).

Almost surely, 2^3947998 is an apocalyptic number.

3947998 is a deficient number, since it is larger than the sum of its proper divisors (1974002).

3947998 is a wasteful number, since it uses less digits than its factorization.

3947998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1974001.

The product of its digits is 489888, while the sum is 49.

The square root of 3947998 is about 1986.9569698411. The cubic root of 3947998 is about 158.0492022164.

The spelling of 3947998 in words is "three million, nine hundred forty-seven thousand, nine hundred ninety-eight".