139228787 has 4 divisors (see below), whose sum is σ = 139731696. Its totient is φ = 138725880.

The previous prime is 139228783. The next prime is 139228801. The reversal of 139228787 is 787822931.

139228787 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 139228787 - 2² = 139228783 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139228783) 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, 251039 + ... + 251592.

It is an arithmetic number, because the mean of its divisors is an integer number (34932924).

Almost surely, 2^139228787 is an apocalyptic number.

139228787 is a deficient number, since it is larger than the sum of its proper divisors (502909).

139228787 is an equidigital number, since it uses as much as digits as its factorization.

139228787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502908.

The product of its digits is 338688, while the sum is 47.

The square root of 139228787 is about 11799.5248633155. The cubic root of 139228787 is about 518.2941971557.

The spelling of 139228787 in words is "one hundred thirty-nine million, two hundred twenty-eight thousand, seven hundred eighty-seven".