3891457 has 4 divisors (see below), whose sum is σ = 3982000. Its totient is φ = 3800916.

The previous prime is 3891451. The next prime is 3891467. The reversal of 3891457 is 7541983.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3891457 - 2³ = 3891449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3891451) 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, 45207 + ... + 45292.

It is an arithmetic number, because the mean of its divisors is an integer number (995500).

Almost surely, 2^3891457 is an apocalyptic number.

It is an amenable number.

3891457 is a deficient number, since it is larger than the sum of its proper divisors (90543).

3891457 is an equidigital number, since it uses as much as digits as its factorization.

3891457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90542.

The product of its digits is 30240, while the sum is 37.

The square root of 3891457 is about 1972.6776219139. The cubic root of 3891457 is about 157.2910742859.

The spelling of 3891457 in words is "three million, eight hundred ninety-one thousand, four hundred fifty-seven".