3490721 has 4 divisors (see below), whose sum is σ = 3759252. Its totient is φ = 3222192.

The previous prime is 3490709. The next prime is 3490727. The reversal of 3490721 is 1270943.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1852321 + 1638400 = 1361^2 + 1280^2 .

It is a cyclic number.

It is not a de Polignac number, because 3490721 - 2¹⁰ = 3489697 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3490727) 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, 134246 + ... + 134271.

It is an arithmetic number, because the mean of its divisors is an integer number (939813).

Almost surely, 2^3490721 is an apocalyptic number.

It is an amenable number.

3490721 is a deficient number, since it is larger than the sum of its proper divisors (268531).

3490721 is a wasteful number, since it uses less digits than its factorization.

3490721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268530.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 3490721 is about 1868.3471304873. The cubic root of 3490721 is about 151.6951559948.

The spelling of 3490721 in words is "three million, four hundred ninety thousand, seven hundred twenty-one".