3850405 has 16 divisors (see below), whose sum is σ = 5113584. Its totient is φ = 2764800.

The previous prime is 3850403. The next prime is 3850421. The reversal of 3850405 is 5040583.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 401956 + 3448449 = 634^2 + 1857^2 .

It is not a de Polignac number, because 3850405 - 2¹ = 3850403 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3850405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3850403) 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, 1605 + ... + 3205.

It is an arithmetic number, because the mean of its divisors is an integer number (319599).

Almost surely, 2^3850405 is an apocalyptic number.

It is an amenable number.

3850405 is a deficient number, since it is larger than the sum of its proper divisors (1263179).

3850405 is a wasteful number, since it uses less digits than its factorization.

3850405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1656.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 3850405 is about 1962.2448878771. The cubic root of 3850405 is about 156.7360162769.

Adding to 3850405 its reverse (5040583), we get a palindrome (8890988).

The spelling of 3850405 in words is "three million, eight hundred fifty thousand, four hundred five".