4012891 has 4 divisors (see below), whose sum is σ = 4029784. Its totient is φ = 3996000.

The previous prime is 4012873. The next prime is 4012927. The reversal of 4012891 is 1982104.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 4012891 - 2¹³ = 4004699 is a prime.

It is a super-2 number, since 2×4012891² = 32206588355762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4012861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8085 + ... + 8566.

It is an arithmetic number, because the mean of its divisors is an integer number (1007446).

Almost surely, 2^4012891 is an apocalyptic number.

4012891 is a deficient number, since it is larger than the sum of its proper divisors (16893).

4012891 is a wasteful number, since it uses less digits than its factorization.

4012891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16892.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 4012891 is about 2003.2201576462. The cubic root of 4012891 is about 158.9104488940.

Adding to 4012891 its reverse (1982104), we get a palindrome (5994995).

The spelling of 4012891 in words is "four million, twelve thousand, eight hundred ninety-one".