139243412 has 72 divisors (see below), whose sum is σ = 310849728. Its totient is φ = 53412480.

The previous prime is 139243411. The next prime is 139243427. The reversal of 139243412 is 214342931.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139243411) 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 23 ways as a sum of consecutive naturals, for example, 247043 + ... + 247605.

Almost surely, 2^139243412 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 139243412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (155424864).

139243412 is an abundant number, since it is smaller than the sum of its proper divisors (171606316).

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

139243412 is a wasteful number, since it uses less digits than its factorization.

139243412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669 (or 656 counting only the distinct ones).

The product of its digits is 5184, while the sum is 29.

The square root of 139243412 is about 11800.1445753855. The cubic root of 139243412 is about 518.3123442343.

It can be divided in two parts, 139243 and 412, that multiplied together give a triangular number (57368116 = T₁₀₇₁₁).

The spelling of 139243412 in words is "one hundred thirty-nine million, two hundred forty-three thousand, four hundred twelve".