163439440 has 80 divisors (see below), whose sum is σ = 399260160. Its totient is φ = 62138880.

The previous prime is 163439401. The next prime is 163439443. The reversal of 163439440 is 44934361.

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

It is a junction number, because it is equal to n+sod(n) for n = 163439396 and 163439405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163439443) 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, 145762 + ... + 146878.

It is an arithmetic number, because the mean of its divisors is an integer number (4990752).

Almost surely, 2^163439440 is an apocalyptic number.

163439440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 163439440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (199630080).

163439440 is an abundant number, since it is smaller than the sum of its proper divisors (235820720).

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

163439440 is a wasteful number, since it uses less digits than its factorization.

163439440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1220 (or 1214 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 34.

The square root of 163439440 is about 12784.3435498269. The cubic root of 163439440 is about 546.7460093708.

The spelling of 163439440 in words is "one hundred sixty-three million, four hundred thirty-nine thousand, four hundred forty".