139740979 has 4 divisors (see below), whose sum is σ = 159703984. Its totient is φ = 119777976.

The previous prime is 139740949. The next prime is 139740983. The reversal of 139740979 is 979047931.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 139740979 - 2¹¹ = 139738931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139740919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9981492 + ... + 9981505.

It is an arithmetic number, because the mean of its divisors is an integer number (39925996).

Almost surely, 2^139740979 is an apocalyptic number.

139740979 is a deficient number, since it is larger than the sum of its proper divisors (19963005).

139740979 is an equidigital number, since it uses as much as digits as its factorization.

139740979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19963004.

The product of its (nonzero) digits is 428652, while the sum is 49.

The square root of 139740979 is about 11821.2088637330. The cubic root of 139740979 is about 518.9289827254.

The spelling of 139740979 in words is "one hundred thirty-nine million, seven hundred forty thousand, nine hundred seventy-nine".