3991354 has 4 divisors (see below), whose sum is σ = 5987034. Its totient is φ = 1995676.

The previous prime is 3991333. The next prime is 3991369. The reversal of 3991354 is 4531993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4531993 = 79 ⋅57367.

It can be written as a sum of positive squares in only one way, i.e., 2634129 + 1357225 = 1623^2 + 1165^2 .

It is a nialpdrome in base 13.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 997837 + ... + 997840.

Almost surely, 2^3991354 is an apocalyptic number.

3991354 is a deficient number, since it is larger than the sum of its proper divisors (1995680).

3991354 is a wasteful number, since it uses less digits than its factorization.

3991354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1995679.

The product of its digits is 14580, while the sum is 34.

The square root of 3991354 is about 1997.8373307154. The cubic root of 3991354 is about 158.6256504467.

The spelling of 3991354 in words is "three million, nine hundred ninety-one thousand, three hundred fifty-four".