3840905 has 8 divisors (see below), whose sum is σ = 4768200. Its totient is φ = 2966656.

The previous prime is 3840853. The next prime is 3840911. The reversal of 3840905 is 5090483.

3840905 = T₁₂₃₇ + T₁₂₃₈ + ... + T₁₂₄₁.

It can be written as a sum of positive squares in 4 ways, for example, as 139129 + 3701776 = 373^2 + 1924^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3840905 - 2⁸ = 3840649 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13100 + ... + 13389.

It is an arithmetic number, because the mean of its divisors is an integer number (596025).

Almost surely, 2^3840905 is an apocalyptic number.

It is an amenable number.

3840905 is a deficient number, since it is larger than the sum of its proper divisors (927295).

3840905 is a wasteful number, since it uses less digits than its factorization.

3840905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26523.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 3840905 is about 1959.8226960621. The cubic root of 3840905 is about 156.6070066083.

The spelling of 3840905 in words is "three million, eight hundred forty thousand, nine hundred five".