3780391 has 2 divisors, whose sum is σ = 3780392. Its totient is φ = 3780390.

The previous prime is 3780389. The next prime is 3780397. The reversal of 3780391 is 1930873.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3780391 - 2¹ = 3780389 is a prime.

It is a super-2 number, since 2×3780391² = 28582712225762, which contains 22 as substring.

Together with 3780389, it forms a pair of twin primes.

It is a Chen prime.

3780391 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3780397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1890195 + 1890196.

It is an arithmetic number, because the mean of its divisors is an integer number (1890196).

Almost surely, 2^3780391 is an apocalyptic number.

3780391 is a deficient number, since it is larger than the sum of its proper divisors (1).

3780391 is an equidigital number, since it uses as much as digits as its factorization.

3780391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 3780391 is about 1944.3227612719. The cubic root of 3780391 is about 155.7801939423.

The spelling of 3780391 in words is "three million, seven hundred eighty thousand, three hundred ninety-one".