139937940409 has 4 divisors (see below), whose sum is σ = 144763386660. Its totient is φ = 135112494160.

The previous prime is 139937940407. The next prime is 139937940437. The reversal of 139937940409 is 904049739931.

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

It can be written as a sum of positive squares in 2 ways, for example, as 41464362384 + 98473578025 = 203628^2 + 313805^2 .

It is a cyclic number.

It is not a de Polignac number, because 139937940409 - 2¹ = 139937940407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139937940403) 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, 2412723082 + ... + 2412723139.

It is an arithmetic number, because the mean of its divisors is an integer number (36190846665).

Almost surely, 2^139937940409 is an apocalyptic number.

It is an amenable number.

139937940409 is a deficient number, since it is larger than the sum of its proper divisors (4825446251).

139937940409 is an equidigital number, since it uses as much as digits as its factorization.

139937940409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4825446250.

The product of its (nonzero) digits is 6613488, while the sum is 58.

The spelling of 139937940409 in words is "one hundred thirty-nine billion, nine hundred thirty-seven million, nine hundred forty thousand, four hundred nine".