139497471 has 10 divisors (see below), whose sum is σ = 208385232. Its totient is φ = 92998260.

The previous prime is 139497469. The next prime is 139497497. The reversal of 139497471 is 174794931.

139497471 is a `hidden beast` number, since 1 + 3 + 94 + 97 + 471 = 666.

It is not a de Polignac number, because 139497471 - 2¹ = 139497469 is a prime.

It is a super-3 number, since 3×139497471³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139497451) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 861015 + ... + 861176.

Almost surely, 2^139497471 is an apocalyptic number.

139497471 is a deficient number, since it is larger than the sum of its proper divisors (68887761).

139497471 is an equidigital number, since it uses as much as digits as its factorization.

139497471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1722203 (or 1722194 counting only the distinct ones).

The product of its digits is 190512, while the sum is 45.

The square root of 139497471 is about 11810.9047494254. The cubic root of 139497471 is about 518.6273846553.

The spelling of 139497471 in words is "one hundred thirty-nine million, four hundred ninety-seven thousand, four hundred seventy-one".