3923729 has 4 divisors (see below), whose sum is σ = 4059060. Its totient is φ = 3788400.

The previous prime is 3923723. The next prime is 3923737. The reversal of 3923729 is 9273293.

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 2356225 + 1567504 = 1535^2 + 1252^2 .

It is a cyclic number.

It is not a de Polignac number, because 3923729 - 2¹⁶ = 3858193 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3923723) 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, 67622 + ... + 67679.

It is an arithmetic number, because the mean of its divisors is an integer number (1014765).

Almost surely, 2^3923729 is an apocalyptic number.

It is an amenable number.

3923729 is a deficient number, since it is larger than the sum of its proper divisors (135331).

3923729 is a wasteful number, since it uses less digits than its factorization.

3923729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135330.

The product of its digits is 20412, while the sum is 35.

The square root of 3923729 is about 1980.8404781809. The cubic root of 3923729 is about 157.7246847780.

The spelling of 3923729 in words is "three million, nine hundred twenty-three thousand, seven hundred twenty-nine".