3765691 has 4 divisors (see below), whose sum is σ = 3787632. Its totient is φ = 3743752.

The previous prime is 3765689. The next prime is 3765701. The reversal of 3765691 is 1965673.

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 3765691 - 2¹ = 3765689 is a prime.

It is a Duffinian number.

3765691 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 3765691.

It is not an unprimeable number, because it can be changed into a prime (3765611) 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, 10711 + ... + 11056.

It is an arithmetic number, because the mean of its divisors is an integer number (946908).

Almost surely, 2^3765691 is an apocalyptic number.

3765691 is a deficient number, since it is larger than the sum of its proper divisors (21941).

3765691 is a wasteful number, since it uses less digits than its factorization.

3765691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21940.

The product of its digits is 34020, while the sum is 37.

The square root of 3765691 is about 1940.5388426929. The cubic root of 3765691 is about 155.5780152566.

The spelling of 3765691 in words is "three million, seven hundred sixty-five thousand, six hundred ninety-one".