3729821 has 4 divisors (see below), whose sum is σ = 3740352. Its totient is φ = 3719292.

The previous prime is 3729809. The next prime is 3729853. The reversal of 3729821 is 1289273.

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 a de Polignac number, because none of the positive numbers 2^k-3729821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3729521) 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 3 ways as a sum of consecutive naturals, for example, 4715 + ... + 5448.

It is an arithmetic number, because the mean of its divisors is an integer number (935088).

Almost surely, 2^3729821 is an apocalyptic number.

It is an amenable number.

3729821 is a deficient number, since it is larger than the sum of its proper divisors (10531).

3729821 is a wasteful number, since it uses less digits than its factorization.

3729821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10530.

The product of its digits is 6048, while the sum is 32.

The square root of 3729821 is about 1931.2744496834. The cubic root of 3729821 is about 155.0824535289.

The spelling of 3729821 in words is "three million, seven hundred twenty-nine thousand, eight hundred twenty-one".