3781139 has 4 divisors (see below), whose sum is σ = 3798024. Its totient is φ = 3764256.

The previous prime is 3781121. The next prime is 3781147. The reversal of 3781139 is 9311873.

3781139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3781139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3781189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8102 + ... + 8555.

It is an arithmetic number, because the mean of its divisors is an integer number (949506).

Almost surely, 2^3781139 is an apocalyptic number.

3781139 is a deficient number, since it is larger than the sum of its proper divisors (16885).

3781139 is a wasteful number, since it uses less digits than its factorization.

3781139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16884.

The product of its digits is 4536, while the sum is 32.

The square root of 3781139 is about 1944.5151066526. The cubic root of 3781139 is about 155.7904676504.

The spelling of 3781139 in words is "three million, seven hundred eighty-one thousand, one hundred thirty-nine".