3787381 has 4 divisors (see below), whose sum is σ = 4078732. Its totient is φ = 3496032.

The previous prime is 3787369. The next prime is 3787391. The reversal of 3787381 is 1837873.

It is the 795-th star number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 654481 + 3132900 = 809^2 + 1770^2 .

It is a cyclic number.

It is not a de Polignac number, because 3787381 - 2⁵ = 3787349 is a prime.

It is a super-2 number, since 2×3787381² = 28688509678322, which contains 22 as substring.

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 3787381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3787321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 145656 + ... + 145681.

It is an arithmetic number, because the mean of its divisors is an integer number (1019683).

Almost surely, 2^3787381 is an apocalyptic number.

It is an amenable number.

3787381 is a deficient number, since it is larger than the sum of its proper divisors (291351).

3787381 is a wasteful number, since it uses less digits than its factorization.

3787381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291350.

The product of its digits is 28224, while the sum is 37.

The square root of 3787381 is about 1946.1194721805. The cubic root of 3787381 is about 155.8761481360.

The spelling of 3787381 in words is "three million, seven hundred eighty-seven thousand, three hundred eighty-one".