139649958 has 48 divisors (see below), whose sum is σ = 347002656. Its totient is φ = 39761280.

The previous prime is 139649957. The next prime is 139650001. The reversal of 139649958 is 859946931.

139649958 is a `hidden beast` number, since 13 + 96 + 499 + 58 = 666.

It is a super-2 number, since 2×139649958² = 39004221538803528, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139649957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37668 + ... + 41208.

It is an arithmetic number, because the mean of its divisors is an integer number (7229222).

Almost surely, 2^139649958 is an apocalyptic number.

139649958 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 139649958, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (173501328).

139649958 is an abundant number, since it is smaller than the sum of its proper divisors (207352698).

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

139649958 is a wasteful number, since it uses less digits than its factorization.

139649958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3869 (or 3866 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 54.

The square root of 139649958 is about 11817.3583342471. The cubic root of 139649958 is about 518.8162892401.

The spelling of 139649958 in words is "one hundred thirty-nine million, six hundred forty-nine thousand, nine hundred fifty-eight".