139242771 has 6 divisors (see below), whose sum is σ = 201128460. Its totient is φ = 92828508.

The previous prime is 139242751. The next prime is 139242787. The reversal of 139242771 is 177242931.

It is not a de Polignac number, because 139242771 - 2¹¹ = 139240723 is a prime.

It is not an unprimeable number, because it can be changed into a prime (139242721) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7735701 + ... + 7735718.

It is an arithmetic number, because the mean of its divisors is an integer number (33521410).

Almost surely, 2^139242771 is an apocalyptic number.

139242771 is a deficient number, since it is larger than the sum of its proper divisors (61885689).

139242771 is a wasteful number, since it uses less digits than its factorization.

139242771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15471425 (or 15471422 counting only the distinct ones).

The product of its digits is 21168, while the sum is 36.

The square root of 139242771 is about 11800.1174146701. The cubic root of 139242771 is about 518.3115488915.

The spelling of 139242771 in words is "one hundred thirty-nine million, two hundred forty-two thousand, seven hundred seventy-one".