3840397 has 8 divisors (see below), whose sum is σ = 4229280. Its totient is φ = 3458160.

The previous prime is 3840391. The next prime is 3840401. The reversal of 3840397 is 7930483.

3840397 is nontrivially palindromic in base 9.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3840397 is a prime.

It is an Ulam number.

It is a nialpdrome in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3840391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 403 + ... + 2800.

It is an arithmetic number, because the mean of its divisors is an integer number (528660).

Almost surely, 2^3840397 is an apocalyptic number.

3840397 is the 1048-th centered heptagonal number.

It is an amenable number.

3840397 is a deficient number, since it is larger than the sum of its proper divisors (388883).

3840397 is a wasteful number, since it uses less digits than its factorization.

3840397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3323.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 3840397 is about 1959.6930882156. The cubic root of 3840397 is about 156.6001019971.

The spelling of 3840397 in words is "three million, eight hundred forty thousand, three hundred ninety-seven".