3998643375 has 16 divisors (see below), whose sum is σ = 6653743200. Its totient is φ = 2132609600.

The previous prime is 3998643373. The next prime is 3998643409. The reversal of 3998643375 is 5733468993.

It is a happy number.

It is not a de Polignac number, because 3998643375 - 2¹ = 3998643373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3998643373) 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, 5331150 + ... + 5331899.

It is an arithmetic number, because the mean of its divisors is an integer number (415858950).

Almost surely, 2^3998643375 is an apocalyptic number.

3998643375 is a deficient number, since it is larger than the sum of its proper divisors (2655099825).

3998643375 is a wasteful number, since it uses less digits than its factorization.

3998643375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10663067 (or 10663057 counting only the distinct ones).

The product of its digits is 14696640, while the sum is 57.

The square root of 3998643375 is about 63234.8272315186. The cubic root of 3998643375 is about 1587.2215726802.

The spelling of 3998643375 in words is "three billion, nine hundred ninety-eight million, six hundred forty-three thousand, three hundred seventy-five".