3991734 has 32 divisors (see below), whose sum is σ = 9180000. Its totient is φ = 1284192.

The previous prime is 3991727. The next prime is 3991747. The reversal of 3991734 is 4371993.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 292 + ... + 2840.

It is an arithmetic number, because the mean of its divisors is an integer number (286875).

Almost surely, 2^3991734 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3991734, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4590000).

3991734 is an abundant number, since it is smaller than the sum of its proper divisors (5188266).

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

3991734 is a wasteful number, since it uses less digits than its factorization.

3991734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2589 (or 2583 counting only the distinct ones).

The product of its digits is 20412, while the sum is 36.

The square root of 3991734 is about 1997.9324312899. The cubic root of 3991734 is about 158.6306843136.

The spelling of 3991734 in words is "three million, nine hundred ninety-one thousand, seven hundred thirty-four".