3898405 has 16 divisors (see below), whose sum is σ = 5520384. Its totient is φ = 2586240.

The previous prime is 3898393. The next prime is 3898409. The reversal of 3898405 is 5048983.

It is not a de Polignac number, because 3898405 - 2⁵ = 3898373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3898409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 712 + ... + 2881.

It is an arithmetic number, because the mean of its divisors is an integer number (345024).

Almost surely, 2^3898405 is an apocalyptic number.

3898405 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3898405 is a deficient number, since it is larger than the sum of its proper divisors (1621979).

3898405 is a wasteful number, since it uses less digits than its factorization.

3898405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3636.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 3898405 is about 1974.4378946931. The cubic root of 3898405 is about 157.3846303854.

The spelling of 3898405 in words is "three million, eight hundred ninety-eight thousand, four hundred five".