3240389891 has 4 divisors (see below), whose sum is σ = 3381276432. Its totient is φ = 3099503352.

The previous prime is 3240389863. The next prime is 3240389909. The reversal of 3240389891 is 1989830423.

It is a happy number.

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-3240389891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3240389861) 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, 70443236 + ... + 70443281.

It is an arithmetic number, because the mean of its divisors is an integer number (845319108).

Almost surely, 2^3240389891 is an apocalyptic number.

3240389891 is a deficient number, since it is larger than the sum of its proper divisors (140886541).

3240389891 is a wasteful number, since it uses less digits than its factorization.

3240389891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140886540.

The product of its (nonzero) digits is 373248, while the sum is 47.

The square root of 3240389891 is about 56924.4226233345. The cubic root of 3240389891 is about 1479.7865973961.

The spelling of 3240389891 in words is "three billion, two hundred forty million, three hundred eighty-nine thousand, eight hundred ninety-one".