139436442 has 24 divisors (see below), whose sum is σ = 315248544. Its totient is φ = 44457864.

The previous prime is 139436413. The next prime is 139436489. The reversal of 139436442 is 244634931.

It is a happy number.

139436442 is a `hidden beast` number, since 1 + 3 + 9 + 4 + 3 + 644 + 2 = 666.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 139436397 and 139436406.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 167988 + ... + 168815.

It is an arithmetic number, because the mean of its divisors is an integer number (13135356).

Almost surely, 2^139436442 is an apocalyptic number.

139436442 is an abundant number, since it is smaller than the sum of its proper divisors (175812102).

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

139436442 is a wasteful number, since it uses less digits than its factorization.

139436442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336834 (or 336831 counting only the distinct ones).

The product of its digits is 62208, while the sum is 36.

The square root of 139436442 is about 11808.3208797864. The cubic root of 139436442 is about 518.5517418802.

The spelling of 139436442 in words is "one hundred thirty-nine million, four hundred thirty-six thousand, four hundred forty-two".