3870391 has 4 divisors (see below), whose sum is σ = 4423312. Its totient is φ = 3317472.

The previous prime is 3870337. The next prime is 3870401. The reversal of 3870391 is 1930783.

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 3870391 - 2¹⁷ = 3739319 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3871391) 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, 276450 + ... + 276463.

It is an arithmetic number, because the mean of its divisors is an integer number (1105828).

Almost surely, 2^3870391 is an apocalyptic number.

3870391 is a deficient number, since it is larger than the sum of its proper divisors (552921).

3870391 is an equidigital number, since it uses as much as digits as its factorization.

3870391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552920.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 3870391 is about 1967.3309330156. The cubic root of 3870391 is about 157.0067342643.

The spelling of 3870391 in words is "three million, eight hundred seventy thousand, three hundred ninety-one".