163906893 has 6 divisors (see below), whose sum is σ = 236754414. Its totient is φ = 109271256.

The previous prime is 163906861. The next prime is 163906913. The reversal of 163906893 is 398609361.

163906893 is a `hidden beast` number, since 1 + 639 + 0 + 6 + 8 + 9 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 144432324 + 19474569 = 12018^2 + 4413^2 .

It is not a de Polignac number, because 163906893 - 2⁵ = 163906861 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163906493) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9105930 + ... + 9105947.

It is an arithmetic number, because the mean of its divisors is an integer number (39459069).

Almost surely, 2^163906893 is an apocalyptic number.

It is an amenable number.

163906893 is a deficient number, since it is larger than the sum of its proper divisors (72847521).

163906893 is a wasteful number, since it uses less digits than its factorization.

163906893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18211883 (or 18211880 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 45.

The square root of 163906893 is about 12802.6127411556. The cubic root of 163906893 is about 547.2667624791.

The spelling of 163906893 in words is "one hundred sixty-three million, nine hundred six thousand, eight hundred ninety-three".