140197981 has 12 divisors (see below), whose sum is σ = 176117536. Its totient is φ = 109244520.

The previous prime is 140197961. The next prime is 140198053. The reversal of 140197981 is 189791041.

It is not a de Polignac number, because 140197981 - 2⁷ = 140197853 is a prime.

It is a super-2 number, since 2×140197981² = 39310947752952722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140197961) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 81915 + ... + 83608.

Almost surely, 2^140197981 is an apocalyptic number.

140197981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

140197981 is a deficient number, since it is larger than the sum of its proper divisors (35919555).

140197981 is a wasteful number, since it uses less digits than its factorization.

140197981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165552 (or 165541 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 40.

The square root of 140197981 is about 11840.5228347400. The cubic root of 140197981 is about 519.4940604151.

The spelling of 140197981 in words is "one hundred forty million, one hundred ninety-seven thousand, nine hundred eighty-one".