3900855 has 32 divisors (see below), whose sum is σ = 7225344. Its totient is φ = 1760256.

The previous prime is 3900847. The next prime is 3900857. The reversal of 3900855 is 5580093.

It is not a de Polignac number, because 3900855 - 2³ = 3900847 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3900857) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9994 + ... + 10376.

It is an arithmetic number, because the mean of its divisors is an integer number (225792).

Almost surely, 2^3900855 is an apocalyptic number.

3900855 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

3900855 is a deficient number, since it is larger than the sum of its proper divisors (3324489).

3900855 is a wasteful number, since it uses less digits than its factorization.

3900855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 3900855 is about 1975.0582269898. The cubic root of 3900855 is about 157.4175935755.

The spelling of 3900855 in words is "three million, nine hundred thousand, eight hundred fifty-five".