3991654 has 4 divisors (see below), whose sum is σ = 5987484. Its totient is φ = 1995826.

The previous prime is 3991649. The next prime is 3991667. The reversal of 3991654 is 4561993.

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

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, 997912 + ... + 997915.

It is an arithmetic number, because the mean of its divisors is an integer number (1496871).

Almost surely, 2^3991654 is an apocalyptic number.

3991654 is a deficient number, since it is larger than the sum of its proper divisors (1995830).

3991654 is a wasteful number, since it uses less digits than its factorization.

3991654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1995829.

The product of its digits is 29160, while the sum is 37.

The square root of 3991654 is about 1997.9124104925. The cubic root of 3991654 is about 158.6296245787.

The spelling of 3991654 in words is "three million, nine hundred ninety-one thousand, six hundred fifty-four".