3902857 has 4 divisors (see below), whose sum is σ = 4460416. Its totient is φ = 3345300.

The previous prime is 3902851. The next prime is 3902861. The reversal of 3902857 is 7582093.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-3902857 is a prime.

It is a Duffinian number.

3902857 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3902851) 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, 278769 + ... + 278782.

It is an arithmetic number, because the mean of its divisors is an integer number (1115104).

Almost surely, 2^3902857 is an apocalyptic number.

It is an amenable number.

3902857 is a deficient number, since it is larger than the sum of its proper divisors (557559).

3902857 is an equidigital number, since it uses as much as digits as its factorization.

3902857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557558.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 3902857 is about 1975.5649824797. The cubic root of 3902857 is about 157.4445189653. Note that the first 3 decimals are identical.

The spelling of 3902857 in words is "three million, nine hundred two thousand, eight hundred fifty-seven".