3431781 has 8 divisors (see below), whose sum is σ = 5084160. Its totient is φ = 2287836.

The previous prime is 3431767. The next prime is 3431783. The reversal of 3431781 is 1871343.

It is not a de Polignac number, because 3431781 - 2⁵ = 3431749 is a prime.

It is a super-2 number, since 2×3431781² = 23554241663922, 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: 127103 = 3431781 / (3 + 4 + 3 + 1 + 7 + 8 + 1).

3431781 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3431783) 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, 63525 + ... + 63578.

It is an arithmetic number, because the mean of its divisors is an integer number (635520).

Almost surely, 2^3431781 is an apocalyptic number.

It is an amenable number.

3431781 is a deficient number, since it is larger than the sum of its proper divisors (1652379).

3431781 is a wasteful number, since it uses less digits than its factorization.

3431781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127112 (or 127106 counting only the distinct ones).

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

The square root of 3431781 is about 1852.5066801499. The cubic root of 3431781 is about 150.8365261543.

The spelling of 3431781 in words is "three million, four hundred thirty-one thousand, seven hundred eighty-one".