140709981 has 16 divisors (see below), whose sum is σ = 193122560. Its totient is φ = 91091520.

The previous prime is 140709977. The next prime is 140710007. The reversal of 140709981 is 189907041.

It is a happy number.

It is not a de Polignac number, because 140709981 - 2² = 140709977 is a prime.

It is a super-2 number, since 2×140709981² = 39598597506040722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140709911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9591 + ... + 19323.

It is an arithmetic number, because the mean of its divisors is an integer number (12070160).

Almost surely, 2^140709981 is an apocalyptic number.

It is an amenable number.

140709981 is a deficient number, since it is larger than the sum of its proper divisors (52412579).

140709981 is an equidigital number, since it uses as much as digits as its factorization.

140709981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9876.

The product of its (nonzero) digits is 18144, while the sum is 39.

The square root of 140709981 is about 11862.1237980389. The cubic root of 140709981 is about 520.1256858417.

The spelling of 140709981 in words is "one hundred forty million, seven hundred nine thousand, nine hundred eighty-one".