3486721 has 4 divisors (see below), whose sum is σ = 3984832. Its totient is φ = 2988612.

The previous prime is 3486713. The next prime is 3486727. The reversal of 3486721 is 1276843.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1276843 = 73 ⋅17491.

It is a cyclic number.

It is not a de Polignac number, because 3486721 - 2³ = 3486713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3486727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 249045 + ... + 249058.

It is an arithmetic number, because the mean of its divisors is an integer number (996208).

Almost surely, 2^3486721 is an apocalyptic number.

It is an amenable number.

3486721 is a deficient number, since it is larger than the sum of its proper divisors (498111).

3486721 is an equidigital number, since it uses as much as digits as its factorization.

3486721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498110.

The product of its digits is 8064, while the sum is 31.

The square root of 3486721 is about 1867.2763587643. The cubic root of 3486721 is about 151.6371916047.

The spelling of 3486721 in words is "three million, four hundred eighty-six thousand, seven hundred twenty-one".