139855842 has 64 divisors (see below), whose sum is σ = 361267200. Its totient is φ = 39275280.

The previous prime is 139855841. The next prime is 139855843. The reversal of 139855842 is 248558931.

139855842 is a `hidden beast` number, since 1 + 3 + 98 + 558 + 4 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (139855841) and next prime (139855843).

It is not an unprimeable number, because it can be changed into a prime (139855841) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19167 + ... + 25437.

It is an arithmetic number, because the mean of its divisors is an integer number (5644800).

Almost surely, 2^139855842 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139855842, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (180633600).

139855842 is an abundant number, since it is smaller than the sum of its proper divisors (221411358).

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

139855842 is a wasteful number, since it uses less digits than its factorization.

139855842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6348 (or 6342 counting only the distinct ones).

The product of its digits is 345600, while the sum is 45.

The square root of 139855842 is about 11826.0662098603. The cubic root of 139855842 is about 519.0711252719.

The spelling of 139855842 in words is "one hundred thirty-nine million, eight hundred fifty-five thousand, eight hundred forty-two".