163865442 has 64 divisors (see below), whose sum is σ = 367395840. Its totient is φ = 48672000.

The previous prime is 163865437. The next prime is 163865447. The reversal of 163865442 is 244568361.

It is an interprime number because it is at equal distance from previous prime (163865437) and next prime (163865447).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 163865442.

It is not an unprimeable number, because it can be changed into a prime (163865447) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 408442 + ... + 408842.

It is an arithmetic number, because the mean of its divisors is an integer number (5740560).

Almost surely, 2^163865442 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 163865442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (183697920).

163865442 is an abundant number, since it is smaller than the sum of its proper divisors (203530398).

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

163865442 is a wasteful number, since it uses less digits than its factorization.

163865442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476 (or 450 counting only the distinct ones).

The product of its digits is 138240, while the sum is 39.

The square root of 163865442 is about 12800.9937895462. The cubic root of 163865442 is about 547.2206251737.

The spelling of 163865442 in words is "one hundred sixty-three million, eight hundred sixty-five thousand, four hundred forty-two".