3787691 has 2 divisors, whose sum is σ = 3787692. Its totient is φ = 3787690.

The previous prime is 3787687. The next prime is 3787723. The reversal of 3787691 is 1967873.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3787691 - 2² = 3787687 is a prime.

It is a super-2 number, since 2×3787691² = 28693206222962, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (3787291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1893845 + 1893846.

It is an arithmetic number, because the mean of its divisors is an integer number (1893846).

Almost surely, 2^3787691 is an apocalyptic number.

3787691 is a deficient number, since it is larger than the sum of its proper divisors (1).

3787691 is an equidigital number, since it uses as much as digits as its factorization.

3787691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 41.

The square root of 3787691 is about 1946.1991162263. The cubic root of 3787691 is about 155.8804008802.

The spelling of 3787691 in words is "three million, seven hundred eighty-seven thousand, six hundred ninety-one".