3455781 has 24 divisors (see below), whose sum is σ = 5451840. Its totient is φ = 1907136.

The previous prime is 3455761. The next prime is 3455791. The reversal of 3455781 is 1875543.

It is not a de Polignac number, because 3455781 - 2⁹ = 3455269 is a prime.

It is a super-2 number, since 2×3455781² = 23884844639922, which contains 22 as substring.

3455781 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3455741) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38785 + ... + 38873.

It is an arithmetic number, because the mean of its divisors is an integer number (227160).

Almost surely, 2^3455781 is an apocalyptic number.

It is an amenable number.

3455781 is a deficient number, since it is larger than the sum of its proper divisors (1996059).

3455781 is an equidigital number, since it uses as much as digits as its factorization.

3455781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185 (or 142 counting only the distinct ones).

The product of its digits is 16800, while the sum is 33.

The square root of 3455781 is about 1858.9731036247. The cubic root of 3455781 is about 151.1873323700.

The spelling of 3455781 in words is "three million, four hundred fifty-five thousand, seven hundred eighty-one".