140809979 has 8 divisors (see below), whose sum is σ = 150059520. Its totient is φ = 131821096.

The previous prime is 140809973. The next prime is 140810011. The reversal of 140809979 is 979908041.

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

It is not a de Polignac number, because 140809979 - 2⁸ = 140809723 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (140809973) 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, 64049 + ... + 66210.

It is an arithmetic number, because the mean of its divisors is an integer number (18757440).

Almost surely, 2^140809979 is an apocalyptic number.

140809979 is a deficient number, since it is larger than the sum of its proper divisors (9249541).

140809979 is a wasteful number, since it uses less digits than its factorization.

140809979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130329.

The product of its (nonzero) digits is 163296, while the sum is 47.

The square root of 140809979 is about 11866.3380619296. The cubic root of 140809979 is about 520.2488687931.

The spelling of 140809979 in words is "one hundred forty million, eight hundred nine thousand, nine hundred seventy-nine".