3780991 has 4 divisors (see below), whose sum is σ = 3911400. Its totient is φ = 3650584.

The previous prime is 3780989. The next prime is 3781007. The reversal of 3780991 is 1990873.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1990873 = 47 ⋅42359.

It is a cyclic number.

It is not a de Polignac number, because 3780991 - 2¹ = 3780989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3780991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3780941) 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, 65161 + ... + 65218.

It is an arithmetic number, because the mean of its divisors is an integer number (977850).

Almost surely, 2^3780991 is an apocalyptic number.

3780991 is a deficient number, since it is larger than the sum of its proper divisors (130409).

3780991 is a wasteful number, since it uses less digits than its factorization.

3780991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130408.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 3780991 is about 1944.4770505203. The cubic root of 3780991 is about 155.7884349921.

The spelling of 3780991 in words is "three million, seven hundred eighty thousand, nine hundred ninety-one".