4078665 has 24 divisors (see below), whose sum is σ = 7118280. Its totient is φ = 2160384.

The previous prime is 4078663. The next prime is 4078667. The reversal of 4078665 is 5668704.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (4078663) and next prime (4078667).

It can be written as a sum of positive squares in 4 ways, for example, as 2304 + 4076361 = 48^2 + 2019^2 .

It is not a de Polignac number, because 4078665 - 2¹ = 4078663 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4078663) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10291 + ... + 10679.

It is an arithmetic number, because the mean of its divisors is an integer number (296595).

Almost surely, 2^4078665 is an apocalyptic number.

4078665 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

4078665 is a deficient number, since it is larger than the sum of its proper divisors (3039615).

4078665 is a wasteful number, since it uses less digits than its factorization.

4078665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633 (or 630 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 4078665 is about 2019.5704988933. The cubic root of 4078665 is about 159.7739646798.

The spelling of 4078665 in words is "four million, seventy-eight thousand, six hundred sixty-five".