139724219 has 4 divisors (see below), whose sum is σ = 141492960. Its totient is φ = 137955480.

The previous prime is 139724201. The next prime is 139724227. The reversal of 139724219 is 912427931.

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 139724219 - 2¹² = 139720123 is a prime.

It is a super-2 number, since 2×139724219² = 39045714750319922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139724239) 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, 884252 + ... + 884409.

It is an arithmetic number, because the mean of its divisors is an integer number (35373240).

Almost surely, 2^139724219 is an apocalyptic number.

139724219 is a deficient number, since it is larger than the sum of its proper divisors (1768741).

139724219 is an equidigital number, since it uses as much as digits as its factorization.

139724219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1768740.

The product of its digits is 27216, while the sum is 38.

The square root of 139724219 is about 11820.4999471258. The cubic root of 139724219 is about 518.9082357750.

The spelling of 139724219 in words is "one hundred thirty-nine million, seven hundred twenty-four thousand, two hundred nineteen".