139285477 has 2 divisors, whose sum is σ = 139285478. Its totient is φ = 139285476.

The previous prime is 139285469. The next prime is 139285483. The reversal of 139285477 is 774582931.

139285477 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 132572196 + 6713281 = 11514^2 + 2591^2 .

It is a cyclic number.

It is not a de Polignac number, because 139285477 - 2³ = 139285469 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139285417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69642738 + 69642739.

It is an arithmetic number, because the mean of its divisors is an integer number (69642739).

Almost surely, 2^139285477 is an apocalyptic number.

It is an amenable number.

139285477 is a deficient number, since it is larger than the sum of its proper divisors (1).

139285477 is an equidigital number, since it uses as much as digits as its factorization.

139285477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 423360, while the sum is 46.

The square root of 139285477 is about 11801.9268342080. The cubic root of 139285477 is about 518.3645324930.

It can be divided in two parts, 1392854 and 77, that added together give a palindrome (1392931).

The spelling of 139285477 in words is "one hundred thirty-nine million, two hundred eighty-five thousand, four hundred seventy-seven".