139672221 has 32 divisors (see below), whose sum is σ = 213373440. Its totient is φ = 80507904.

The previous prime is 139672219. The next prime is 139672229. The reversal of 139672221 is 122276931.

139672221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 139672221 - 2¹ = 139672219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139672229) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 193900 + ... + 194618.

It is an arithmetic number, because the mean of its divisors is an integer number (6667920).

Almost surely, 2^139672221 is an apocalyptic number.

It is an amenable number.

139672221 is a deficient number, since it is larger than the sum of its proper divisors (73701219).

139672221 is a wasteful number, since it uses less digits than its factorization.

139672221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1045.

The product of its digits is 9072, while the sum is 33.

The square root of 139672221 is about 11818.3002584974. The cubic root of 139672221 is about 518.8438576773.

The spelling of 139672221 in words is "one hundred thirty-nine million, six hundred seventy-two thousand, two hundred twenty-one".