163640247 has 8 divisors (see below), whose sum is σ = 221764080. Its totient is φ = 107304960.

The previous prime is 163640219. The next prime is 163640251. The reversal of 163640247 is 742046361.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 163640247 - 2⁷ = 163640119 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163640447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 446922 + ... + 447287.

It is an arithmetic number, because the mean of its divisors is an integer number (27720510).

Almost surely, 2^163640247 is an apocalyptic number.

163640247 is a deficient number, since it is larger than the sum of its proper divisors (58123833).

163640247 is an equidigital number, since it uses as much as digits as its factorization.

163640247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 894273.

The product of its (nonzero) digits is 24192, while the sum is 33.

The square root of 163640247 is about 12792.1947686861. The cubic root of 163640247 is about 546.9698343597.

The spelling of 163640247 in words is "one hundred sixty-three million, six hundred forty thousand, two hundred forty-seven".