139691952 has 240 divisors, whose sum is σ = 447749120. Its totient is φ = 41990400.

The previous prime is 139691899. The next prime is 139691953. The reversal of 139691952 is 259196931.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 139691898 and 139691907.

It is not an unprimeable number, because it can be changed into a prime (139691953) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2290002 + ... + 2290062.

Almost surely, 2^139691952 is an apocalyptic number.

139691952 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139691952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (223874560).

139691952 is an abundant number, since it is smaller than the sum of its proper divisors (308057168).

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

139691952 is a wasteful number, since it uses less digits than its factorization.

139691952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134 (or 116 counting only the distinct ones).

The product of its digits is 131220, while the sum is 45.

The square root of 139691952 is about 11819.1349937294. The cubic root of 139691952 is about 518.8682882717.

The spelling of 139691952 in words is "one hundred thirty-nine million, six hundred ninety-one thousand, nine hundred fifty-two".