3878945 has 24 divisors (see below), whose sum is σ = 5632704. Its totient is φ = 2511648.

The previous prime is 3878923. The next prime is 3878947. The reversal of 3878945 is 5498783.

It is a de Polignac number, because none of the positive numbers 2^k-3878945 is a prime.

It is a super-3 number, since 3×3878945³ (a number of 21 digits) contains 333 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 3878896 and 3878905.

It is not an unprimeable number, because it can be changed into a prime (3878947) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12482 + ... + 12788.

It is an arithmetic number, because the mean of its divisors is an integer number (234696).

Almost surely, 2^3878945 is an apocalyptic number.

3878945 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3878945 is a deficient number, since it is larger than the sum of its proper divisors (1753759).

3878945 is a wasteful number, since it uses less digits than its factorization.

3878945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357 (or 338 counting only the distinct ones).

The product of its digits is 241920, while the sum is 44.

The square root of 3878945 is about 1969.5037446017. The cubic root of 3878945 is about 157.1223166777.

The spelling of 3878945 in words is "three million, eight hundred seventy-eight thousand, nine hundred forty-five".