163423440 has 80 divisors (see below), whose sum is σ = 562910400. Its totient is φ = 43579008.

The previous prime is 163423409. The next prime is 163423471. The reversal of 163423440 is 44324361.

163423440 is a `hidden beast` number, since 1 + 634 + 23 + 4 + 4 + 0 = 666.

163423440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (163423409) and next prime (163423471).

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

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35670 + ... + 39989.

It is an arithmetic number, because the mean of its divisors is an integer number (7036380).

Almost surely, 2^163423440 is an apocalyptic number.

163423440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

163423440 is an abundant number, since it is smaller than the sum of its proper divisors (399486960).

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

163423440 is a wasteful number, since it uses less digits than its factorization.

163423440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75681 (or 75669 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

The square root of 163423440 is about 12783.7177690999. The cubic root of 163423440 is about 546.7281674479.

The spelling of 163423440 in words is "one hundred sixty-three million, four hundred twenty-three thousand, four hundred forty".