139947992469 has 24 divisors (see below), whose sum is σ = 205558471872. Its totient is φ = 91729535040.

The previous prime is 139947992461. The next prime is 139947992551. The reversal of 139947992469 is 964299749931.

It is a happy number.

139947992469 is a `hidden beast` number, since 1 + 3 + 9 + 9 + 4 + 79 + 92 + 469 = 666.

It is not a de Polignac number, because 139947992469 - 2³ = 139947992461 is a prime.

It is a super-2 number, since 2×139947992469² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 139947992397 and 139947992406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139947992461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 91432 + ... + 536894.

It is an arithmetic number, because the mean of its divisors is an integer number (8564936328).

Almost surely, 2^139947992469 is an apocalyptic number.

It is an amenable number.

139947992469 is a deficient number, since it is larger than the sum of its proper divisors (65610479403).

139947992469 is a wasteful number, since it uses less digits than its factorization.

139947992469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446057 (or 446054 counting only the distinct ones).

The product of its digits is 238085568, while the sum is 72.

The spelling of 139947992469 in words is "one hundred thirty-nine billion, nine hundred forty-seven million, nine hundred ninety-two thousand, four hundred sixty-nine".