139540856 has 32 divisors (see below), whose sum is σ = 322019040. Its totient is φ = 55202688.

The previous prime is 139540853. The next prime is 139540861. The reversal of 139540856 is 658045931.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139540853) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95111 + ... + 96566.

It is an arithmetic number, because the mean of its divisors is an integer number (10063095).

Almost surely, 2^139540856 is an apocalyptic number.

It is an amenable number.

139540856 is an abundant number, since it is smaller than the sum of its proper divisors (182478184).

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

139540856 is a wasteful number, since it uses less digits than its factorization.

139540856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191703 (or 191699 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 41.

The square root of 139540856 is about 11812.7412567956. The cubic root of 139540856 is about 518.6811450490.

The spelling of 139540856 in words is "one hundred thirty-nine million, five hundred forty thousand, eight hundred fifty-six".