3692721 has 4 divisors (see below), whose sum is σ = 4923632. Its totient is φ = 2461812.

The previous prime is 3692701. The next prime is 3692737. The reversal of 3692721 is 1272963.

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 not a de Polignac number, because 3692721 - 2⁹ = 3692209 is a prime.

It is a D-number.

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 (3692701) 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, 615451 + ... + 615456.

It is an arithmetic number, because the mean of its divisors is an integer number (1230908).

Almost surely, 2^3692721 is an apocalyptic number.

It is an amenable number.

3692721 is a deficient number, since it is larger than the sum of its proper divisors (1230911).

3692721 is a wasteful number, since it uses less digits than its factorization.

3692721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1230910.

The product of its digits is 4536, while the sum is 30.

The square root of 3692721 is about 1921.6453887229. The cubic root of 3692721 is about 154.5665447887.

The spelling of 3692721 in words is "three million, six hundred ninety-two thousand, seven hundred twenty-one".