139991658 has 32 divisors (see below), whose sum is σ = 295410240. Its totient is φ = 44104320.

The previous prime is 139991653. The next prime is 139991659. The reversal of 139991658 is 856199931.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 139991658.

It is not an unprimeable number, because it can be changed into a prime (139991653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58216 + ... + 60572.

It is an arithmetic number, because the mean of its divisors is an integer number (9231570).

Almost surely, 2^139991658 is an apocalyptic number.

139991658 is an abundant number, since it is smaller than the sum of its proper divisors (155418582).

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

139991658 is a wasteful number, since it uses less digits than its factorization.

139991658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2902.

The product of its digits is 524880, while the sum is 51.

The square root of 139991658 is about 11831.8070471082. The cubic root of 139991658 is about 519.2390966979.

The spelling of 139991658 in words is "one hundred thirty-nine million, nine hundred ninety-one thousand, six hundred fifty-eight".