3781431 has 8 divisors (see below), whose sum is σ = 5602160. Its totient is φ = 2520936.

The previous prime is 3781423. The next prime is 3781433. The reversal of 3781431 is 1341873.

It is not a de Polignac number, because 3781431 - 2³ = 3781423 is a prime.

It is a super-2 number, since 2×3781431² = 28598440815522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 140053 = 3781431 / (3 + 7 + 8 + 1 + 4 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3781395 and 3781404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3781433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70000 + ... + 70053.

It is an arithmetic number, because the mean of its divisors is an integer number (700270).

Almost surely, 2^3781431 is an apocalyptic number.

3781431 is a deficient number, since it is larger than the sum of its proper divisors (1820729).

3781431 is a wasteful number, since it uses less digits than its factorization.

3781431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140062 (or 140056 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 3781431 is about 1944.5901881888. The cubic root of 3781431 is about 155.7944778746.

The spelling of 3781431 in words is "three million, seven hundred eighty-one thousand, four hundred thirty-one".