139819497 has 8 divisors (see below), whose sum is σ = 186622656. Its totient is φ = 93114672.

The previous prime is 139819489. The next prime is 139819529. The reversal of 139819497 is 794918931.

It is a happy number.

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

It is not a de Polignac number, because 139819497 - 2³ = 139819489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (139819457) 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, 21198 + ... + 26999.

It is an arithmetic number, because the mean of its divisors is an integer number (23327832).

Almost surely, 2^139819497 is an apocalyptic number.

It is an amenable number.

139819497 is a deficient number, since it is larger than the sum of its proper divisors (46803159).

139819497 is an equidigital number, since it uses as much as digits as its factorization.

139819497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49167.

The product of its digits is 489888, while the sum is 51.

The square root of 139819497 is about 11824.5294620970. The cubic root of 139819497 is about 519.0261568858.

The spelling of 139819497 in words is "one hundred thirty-nine million, eight hundred nineteen thousand, four hundred ninety-seven".