3455721 has 6 divisors (see below), whose sum is σ = 4991610. Its totient is φ = 2303808.

The previous prime is 3455719. The next prime is 3455723. The reversal of 3455721 is 1275543.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (3455719) and next prime (3455723).

It can be written as a sum of positive squares in only one way, i.e., 2433600 + 1022121 = 1560^2 + 1011^2 .

It is not a de Polignac number, because 3455721 - 2¹ = 3455719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3455723) 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 5 ways as a sum of consecutive naturals, for example, 191976 + ... + 191993.

It is an arithmetic number, because the mean of its divisors is an integer number (831935).

Almost surely, 2^3455721 is an apocalyptic number.

It is an amenable number.

3455721 is a deficient number, since it is larger than the sum of its proper divisors (1535889).

3455721 is a wasteful number, since it uses less digits than its factorization.

3455721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383975 (or 383972 counting only the distinct ones).

The product of its digits is 4200, while the sum is 27.

The square root of 3455721 is about 1858.9569656127. The cubic root of 3455721 is about 151.1864573828.

It can be divided in two parts, 34 and 55721, that added together give a palindrome (55755).

The spelling of 3455721 in words is "three million, four hundred fifty-five thousand, seven hundred twenty-one".