139425660 has 144 divisors (see below), whose sum is σ = 468703872. Its totient is φ = 33264000.

The previous prime is 139425647. The next prime is 139425661. The reversal of 139425660 is 66524931.

It is a happy number.

139425660 is a `hidden beast` number, since 1 + 3 + 94 + 2 + 566 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139425661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 132135 + ... + 133185.

It is an arithmetic number, because the mean of its divisors is an integer number (3254888).

Almost surely, 2^139425660 is an apocalyptic number.

139425660 is a gapful number since it is divisible by the number (10) 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 139425660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (234351936).

139425660 is an abundant number, since it is smaller than the sum of its proper divisors (329278212).

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

139425660 is a wasteful number, since it uses less digits than its factorization.

139425660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1144 (or 1139 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 139425660 is about 11807.8643284889. The cubic root of 139425660 is about 518.5383757689.

The spelling of 139425660 in words is "one hundred thirty-nine million, four hundred twenty-five thousand, six hundred sixty".