139811994 has 168 divisors, whose sum is σ = 388758240. Its totient is φ = 37476432.

The previous prime is 139811989. The next prime is 139811999. The reversal of 139811994 is 499118931.

It is an interprime number because it is at equal distance from previous prime (139811989) and next prime (139811999).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (139811999) 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 83 ways as a sum of consecutive naturals, for example, 1357347 + ... + 1357449.

Almost surely, 2^139811994 is an apocalyptic number.

139811994 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 139811994, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (194379120).

139811994 is an abundant number, since it is smaller than the sum of its proper divisors (248946246).

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

139811994 is a wasteful number, since it uses less digits than its factorization.

139811994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156 (or 134 counting only the distinct ones).

The product of its digits is 69984, while the sum is 45.

The square root of 139811994 is about 11824.2121936305. The cubic root of 139811994 is about 519.0168727182.

The spelling of 139811994 in words is "one hundred thirty-nine million, eight hundred eleven thousand, nine hundred ninety-four".