139240687446 has 512 divisors, whose sum is σ = 398529331200. Its totient is φ = 35154362880.

The previous prime is 139240687361. The next prime is 139240687447. The reversal of 139240687446 is 644786042931.

139240687446 is a `hidden beast` number, since 13 + 92 + 40 + 68 + 7 + 446 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 139240687392 and 139240687401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139240687447) 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 255 ways as a sum of consecutive naturals, for example, 769285476 + ... + 769285656.

It is an arithmetic number, because the mean of its divisors is an integer number (778377600).

Almost surely, 2^139240687446 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139240687446, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (199264665600).

139240687446 is an abundant number, since it is smaller than the sum of its proper divisors (259288643754).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

139240687446 is a wasteful number, since it uses less digits than its factorization.

139240687446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361 (or 355 counting only the distinct ones).

The product of its (nonzero) digits is 6967296, while the sum is 54.

The spelling of 139240687446 in words is "one hundred thirty-nine billion, two hundred forty million, six hundred eighty-seven thousand, four hundred forty-six".