3890765 has 4 divisors (see below), whose sum is σ = 4668924. Its totient is φ = 3112608.

The previous prime is 3890759. The next prime is 3890771. The reversal of 3890765 is 5670983.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5670983 = 71 ⋅79873.

It is an interprime number because it is at equal distance from previous prime (3890759) and next prime (3890771).

It can be written as a sum of positive squares in 2 ways, for example, as 2111209 + 1779556 = 1453^2 + 1334^2 .

It is a cyclic number.

It is not a de Polignac number, because 3890765 - 2⁶ = 3890701 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 389072 + ... + 389081.

It is an arithmetic number, because the mean of its divisors is an integer number (1167231).

Almost surely, 2^3890765 is an apocalyptic number.

It is an amenable number.

3890765 is a deficient number, since it is larger than the sum of its proper divisors (778159).

3890765 is an equidigital number, since it uses as much as digits as its factorization.

3890765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778158.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 3890765 is about 1972.5022179962. The cubic root of 3890765 is about 157.2817502825.

The spelling of 3890765 in words is "three million, eight hundred ninety thousand, seven hundred sixty-five".