139402836 has 48 divisors (see below), whose sum is σ = 365500800. Its totient is φ = 45942336.

The previous prime is 139402831. The next prime is 139402841. The reversal of 139402836 is 638204931.

It is an interprime number because it is at equal distance from previous prime (139402831) and next prime (139402841).

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

It is a self number, because there is not a number n which added to its sum of digits gives 139402836.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139402831) 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 15 ways as a sum of consecutive naturals, for example, 2361 + ... + 16863.

It is an arithmetic number, because the mean of its divisors is an integer number (7614600).

Almost surely, 2^139402836 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139402836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (182750400).

139402836 is an abundant number, since it is smaller than the sum of its proper divisors (226097964).

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

139402836 is a wasteful number, since it uses less digits than its factorization.

139402836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14605 (or 14597 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 139402836 is about 11806.8978144134. The cubic root of 139402836 is about 518.5100792900.

The spelling of 139402836 in words is "one hundred thirty-nine million, four hundred two thousand, eight hundred thirty-six".