3994637 has 4 divisors (see below), whose sum is σ = 4003836. Its totient is φ = 3985440.

The previous prime is 3994621. The next prime is 3994681. The reversal of 3994637 is 7364993.

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 2128681 + 1865956 = 1459^2 + 1366^2 .

It is a cyclic number.

It is not a de Polignac number, because 3994637 - 2⁴ = 3994621 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3994594 and 3994603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3994687) 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, 3914 + ... + 4827.

It is an arithmetic number, because the mean of its divisors is an integer number (1000959).

Almost surely, 2^3994637 is an apocalyptic number.

It is an amenable number.

3994637 is a deficient number, since it is larger than the sum of its proper divisors (9199).

3994637 is an equidigital number, since it uses as much as digits as its factorization.

3994637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9198.

The product of its digits is 122472, while the sum is 41.

The square root of 3994637 is about 1998.6588002958. The cubic root of 3994637 is about 158.6691298686.

The spelling of 3994637 in words is "three million, nine hundred ninety-four thousand, six hundred thirty-seven".