139887858 has 48 divisors (see below), whose sum is σ = 314743968. Its totient is φ = 41395200.

The previous prime is 139887857. The next prime is 139887889. The reversal of 139887858 is 858788931.

It is a super-2 number, since 2×139887858² = 39137225631656328, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 139887798 and 139887807.

It is not an unprimeable number, because it can be changed into a prime (139887857) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28978 + ... + 33458.

It is an arithmetic number, because the mean of its divisors is an integer number (6557166).

Almost surely, 2^139887858 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139887858, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (157371984).

139887858 is an abundant number, since it is smaller than the sum of its proper divisors (174856110).

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

139887858 is a wasteful number, since it uses less digits than its factorization.

139887858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4551 (or 4540 counting only the distinct ones).

The product of its digits is 3870720, while the sum is 57.

The square root of 139887858 is about 11827.4197524228. The cubic root of 139887858 is about 519.1107310854.

The spelling of 139887858 in words is "one hundred thirty-nine million, eight hundred eighty-seven thousand, eight hundred fifty-eight".