3892729 has 3 divisors (see below), whose sum is σ = 3894703. Its totient is φ = 3890756.

The previous prime is 3892697. The next prime is 3892741. The reversal of 3892729 is 9272983.

The square root of 3892729 is 1973.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 837225 + 3055504 = 915^2 + 1748^2 .

It is not a de Polignac number, because 3892729 - 2⁵ = 3892697 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3892691 and 3892700.

It is not an unprimeable number, because it can be changed into a prime (3892789) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 987 + ... + 2959.

Almost surely, 2^3892729 is an apocalyptic number.

3892729 is the 1973-rd square number.

3892729 is the 987-th centered octagonal number.

It is an amenable number.

3892729 is a deficient number, since it is larger than the sum of its proper divisors (1974).

3892729 is an frugal number, since it uses more digits than its factorization.

3892729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3946 (or 1973 counting only the distinct ones).

The product of its digits is 54432, while the sum is 40.

The cubic root of 3892729 is about 157.3082103227.

The spelling of 3892729 in words is "three million, eight hundred ninety-two thousand, seven hundred twenty-nine".