139277897 has 6 divisors (see below), whose sum is σ = 153090714. Its totient is φ = 126616160.

The previous prime is 139277867. The next prime is 139277917. The reversal of 139277897 is 798772931.

It can be written as a sum of positive squares in only one way, i.e., 77246521 + 62031376 = 8789^2 + 7876^2 .

It is not a de Polignac number, because 139277897 - 2¹² = 139273801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139277837) 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, 575408 + ... + 575649.

It is an arithmetic number, because the mean of its divisors is an integer number (25515119).

Almost surely, 2^139277897 is an apocalyptic number.

It is an amenable number.

139277897 is a deficient number, since it is larger than the sum of its proper divisors (13812817).

139277897 is a wasteful number, since it uses less digits than its factorization.

139277897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1151079 (or 1151068 counting only the distinct ones).

The product of its digits is 1333584, while the sum is 53.

The square root of 139277897 is about 11801.6056958365. The cubic root of 139277897 is about 518.3551290851.

The spelling of 139277897 in words is "one hundred thirty-nine million, two hundred seventy-seven thousand, eight hundred ninety-seven".