3634721 has 4 divisors (see below), whose sum is σ = 3658944. Its totient is φ = 3610500.

The previous prime is 3634717. The next prime is 3634723. The reversal of 3634721 is 1274363.

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.

It is a cyclic number.

It is not a de Polignac number, because 3634721 - 2² = 3634717 is a prime.

It is a super-2 number, since 2×3634721² = 26422393495682, which contains 22 as substring.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3634723) 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, 11885 + ... + 12186.

It is an arithmetic number, because the mean of its divisors is an integer number (914736).

Almost surely, 2^3634721 is an apocalyptic number.

It is an amenable number.

3634721 is a deficient number, since it is larger than the sum of its proper divisors (24223).

3634721 is a wasteful number, since it uses less digits than its factorization.

3634721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24222.

The product of its digits is 3024, while the sum is 26.

The square root of 3634721 is about 1906.4944269523. The cubic root of 3634721 is about 153.7530336282.

The spelling of 3634721 in words is "three million, six hundred thirty-four thousand, seven hundred twenty-one".