3998890393 has 4 divisors (see below), whose sum is σ = 4091887888. Its totient is φ = 3905892900.

The previous prime is 3998890369. The next prime is 3998890429. The reversal of 3998890393 is 3930988993.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3930988993 = 10357 ⋅379549.

It is a cyclic number.

It is not a de Polignac number, because 3998890393 - 2¹³ = 3998882201 is a prime.

It is a super-2 number, since 2×3998890393² = 31982248750455388898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3998896393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46498683 + ... + 46498768.

It is an arithmetic number, because the mean of its divisors is an integer number (1022971972).

Almost surely, 2^3998890393 is an apocalyptic number.

It is an amenable number.

3998890393 is a deficient number, since it is larger than the sum of its proper divisors (92997495).

3998890393 is an equidigital number, since it uses as much as digits as its factorization.

3998890393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92997494.

The product of its (nonzero) digits is 11337408, while the sum is 61.

The square root of 3998890393 is about 63236.7803813572. The cubic root of 3998890393 is about 1587.2542557836.

The spelling of 3998890393 in words is "three billion, nine hundred ninety-eight million, eight hundred ninety thousand, three hundred ninety-three".