3938857 has 4 divisors (see below), whose sum is σ = 4241860. Its totient is φ = 3635856.

The previous prime is 3938839. The next prime is 3938897. The reversal of 3938857 is 7588393.

It is a happy number.

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 512656 + 3426201 = 716^2 + 1851^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3938857 is a prime.

It is a Duffinian number.

3938857 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3938827) 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, 151482 + ... + 151507.

It is an arithmetic number, because the mean of its divisors is an integer number (1060465).

Almost surely, 2^3938857 is an apocalyptic number.

It is an amenable number.

3938857 is a deficient number, since it is larger than the sum of its proper divisors (303003).

3938857 is a wasteful number, since it uses less digits than its factorization.

3938857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303002.

The product of its digits is 181440, while the sum is 43.

The square root of 3938857 is about 1984.6553857030. The cubic root of 3938857 is about 157.9271281753.

The spelling of 3938857 in words is "three million, nine hundred thirty-eight thousand, eight hundred fifty-seven".