3918945 has 16 divisors (see below), whose sum is σ = 6374592. Its totient is φ = 2055360.

The previous prime is 3918923. The next prime is 3918949. The reversal of 3918945 is 5498193.

It is not a de Polignac number, because 3918945 - 2⁵ = 3918913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3918949) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1227 + ... + 3056.

It is an arithmetic number, because the mean of its divisors is an integer number (398412).

Almost surely, 2^3918945 is an apocalyptic number.

It is an amenable number.

3918945 is a deficient number, since it is larger than the sum of its proper divisors (2455647).

3918945 is a wasteful number, since it uses less digits than its factorization.

3918945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4352.

The product of its digits is 38880, while the sum is 39.

The square root of 3918945 is about 1979.6325416602. The cubic root of 3918945 is about 157.6605568559.

The spelling of 3918945 in words is "three million, nine hundred eighteen thousand, nine hundred forty-five".