140163981 has 8 divisors (see below), whose sum is σ = 187930080. Its totient is φ = 92920272.

The previous prime is 140163977. The next prime is 140164019. The reversal of 140163981 is 189361041.

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

It is not a de Polignac number, because 140163981 - 2² = 140163977 is a prime.

It is a super-2 number, since 2×140163981² = 39291883139536722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140173981) 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, 129970 + ... + 131043.

It is an arithmetic number, because the mean of its divisors is an integer number (23491260).

Almost surely, 2^140163981 is an apocalyptic number.

It is an amenable number.

140163981 is a deficient number, since it is larger than the sum of its proper divisors (47766099).

140163981 is a wasteful number, since it uses less digits than its factorization.

140163981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261195.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 140163981 is about 11839.0870002716. The cubic root of 140163981 is about 519.4520621258.

The spelling of 140163981 in words is "one hundred forty million, one hundred sixty-three thousand, nine hundred eighty-one".