43139542 has 4 divisors (see below), whose sum is σ = 64709316. Its totient is φ = 21569770.

The previous prime is 43139539. The next prime is 43139543. The reversal of 43139542 is 24593134.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24593134 = 2 ⋅12296567.

It is a super-2 number, since 2×43139542² = 3722040167939528, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43139543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10784884 + ... + 10784887.

It is an arithmetic number, because the mean of its divisors is an integer number (16177329).

Almost surely, 2^43139542 is an apocalyptic number.

43139542 is a deficient number, since it is larger than the sum of its proper divisors (21569774).

43139542 is a wasteful number, since it uses less digits than its factorization.

43139542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21569773.

The product of its digits is 12960, while the sum is 31.

The square root of 43139542 is about 6568.0698839157. The cubic root of 43139542 is about 350.7183667374.

It can be divided in two parts, 43139 and 542, that added together give a square (43681 = 209²).

The spelling of 43139542 in words is "forty-three million, one hundred thirty-nine thousand, five hundred forty-two".