139785477 has 12 divisors (see below), whose sum is σ = 201821184. Its totient is φ = 86021520.

The previous prime is 139785469. The next prime is 139785491. The reversal of 139785477 is 774587931.

It is not a de Polignac number, because 139785477 - 2³ = 139785469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139785427) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 137349 + ... + 138362.

It is an arithmetic number, because the mean of its divisors is an integer number (16818432).

Almost surely, 2^139785477 is an apocalyptic number.

It is an amenable number.

139785477 is a deficient number, since it is larger than the sum of its proper divisors (62035707).

139785477 is a wasteful number, since it uses less digits than its factorization.

139785477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275740 (or 275727 counting only the distinct ones).

The product of its digits is 1481760, while the sum is 51.

The square root of 139785477 is about 11823.0908395394. The cubic root of 139785477 is about 518.9840580786.

It can be divided in two parts, 1397854 and 77, that added together give a palindrome (1397931).

The spelling of 139785477 in words is "one hundred thirty-nine million, seven hundred eighty-five thousand, four hundred seventy-seven".