3898405840 has 80 divisors (see below), whose sum is σ = 10638640512. Its totient is φ = 1300465152.

The previous prime is 3898405817. The next prime is 3898405867. The reversal of 3898405840 is 485048983.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×3898405840² = 30395136186692211200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73354 + ... + 114793.

Almost surely, 2^3898405840 is an apocalyptic number.

It is an amenable number.

3898405840 is an abundant number, since it is smaller than the sum of its proper divisors (6740234672).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3898405840 is a wasteful number, since it uses less digits than its factorization.

3898405840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188204 (or 188198 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 49.

The square root of 3898405840 is about 62437.2151845356. The cubic root of 3898405840 is about 1573.8464168939.

The spelling of 3898405840 in words is "three billion, eight hundred ninety-eight million, four hundred five thousand, eight hundred forty".