140531979 has 32 divisors (see below), whose sum is σ = 229340160. Its totient is φ = 74714112.

The previous prime is 140531971. The next prime is 140531987. The reversal of 140531979 is 979135041.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (140531971) and next prime (140531987).

It is not a de Polignac number, because 140531979 - 2³ = 140531971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (140531971) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29562 + ... + 33984.

It is an arithmetic number, because the mean of its divisors is an integer number (7166880).

Almost surely, 2^140531979 is an apocalyptic number.

140531979 is a deficient number, since it is larger than the sum of its proper divisors (88808181).

140531979 is a wasteful number, since it uses less digits than its factorization.

140531979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4539.

The product of its (nonzero) digits is 34020, while the sum is 39.

The square root of 140531979 is about 11854.6184670786. The cubic root of 140531979 is about 519.9062688553.

The spelling of 140531979 in words is "one hundred forty million, five hundred thirty-one thousand, nine hundred seventy-nine".