3820729 has 16 divisors (see below), whose sum is σ = 4455360. Its totient is φ = 3240000.

The previous prime is 3820727. The next prime is 3820759. The reversal of 3820729 is 9270283.

3820729 = 17² + 18² + ... + 225².

It is a cyclic number.

It is not a de Polignac number, because 3820729 - 2¹ = 3820727 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3820729.

It is not an unprimeable number, because it can be changed into a prime (3820727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21019 + ... + 21199.

It is an arithmetic number, because the mean of its divisors is an integer number (278460).

Almost surely, 2^3820729 is an apocalyptic number.

It is an amenable number.

3820729 is a deficient number, since it is larger than the sum of its proper divisors (634631).

3820729 is a wasteful number, since it uses less digits than its factorization.

3820729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 3820729 is about 1954.6685140964. The cubic root of 3820729 is about 156.3323099129.

The spelling of 3820729 in words is "three million, eight hundred twenty thousand, seven hundred twenty-nine".