4212391 has 4 divisors (see below), whose sum is σ = 4253392. Its totient is φ = 4171392.

The previous prime is 4212371. The next prime is 4212401. The reversal of 4212391 is 1932124.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4212391 is a prime.

It is a Duffinian number.

4212391 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4212331) 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, 20346 + ... + 20551.

It is an arithmetic number, because the mean of its divisors is an integer number (1063348).

Almost surely, 2^4212391 is an apocalyptic number.

4212391 is a deficient number, since it is larger than the sum of its proper divisors (41001).

4212391 is a wasteful number, since it uses less digits than its factorization.

4212391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41000.

The product of its digits is 432, while the sum is 22.

The square root of 4212391 is about 2052.4110212138. The cubic root of 4212391 is about 161.5013754448.

The spelling of 4212391 in words is "four million, two hundred twelve thousand, three hundred ninety-one".