3939815 has 8 divisors (see below), whose sum is σ = 5157648. Its totient is φ = 2865280.

The previous prime is 3939811. The next prime is 3939829. The reversal of 3939815 is 5189393.

3939815 = 65² + 66² + ... + 229².

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3939815 - 2² = 3939811 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 (3939811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35762 + ... + 35871.

It is an arithmetic number, because the mean of its divisors is an integer number (644706).

Almost surely, 2^3939815 is an apocalyptic number.

3939815 is a deficient number, since it is larger than the sum of its proper divisors (1217833).

3939815 is a wasteful number, since it uses less digits than its factorization.

3939815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71649.

The product of its digits is 29160, while the sum is 38.

The square root of 3939815 is about 1984.8967227541. The cubic root of 3939815 is about 157.9399306985.

The spelling of 3939815 in words is "three million, nine hundred thirty-nine thousand, eight hundred fifteen".