139274221 has 4 divisors (see below), whose sum is σ = 139308444. Its totient is φ = 139240000.

The previous prime is 139274203. The next prime is 139274257. The reversal of 139274221 is 122472931.

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 65124900 + 74149321 = 8070^2 + 8611^2 .

It is a 4-Lehmer number, since φ(139274221) divides (139274221-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 139274221 - 2⁵ = 139274189 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139274321) 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, 10030 + ... + 19471.

It is an arithmetic number, because the mean of its divisors is an integer number (34827111).

Almost surely, 2^139274221 is an apocalyptic number.

It is an amenable number.

139274221 is a deficient number, since it is larger than the sum of its proper divisors (34223).

139274221 is an equidigital number, since it uses as much as digits as its factorization.

139274221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34222.

The product of its digits is 6048, while the sum is 31.

The square root of 139274221 is about 11801.4499532896. The cubic root of 139274221 is about 518.3505686816.

The spelling of 139274221 in words is "one hundred thirty-nine million, two hundred seventy-four thousand, two hundred twenty-one".