43542731 has 4 divisors (see below), whose sum is σ = 43684872. Its totient is φ = 43400592.

The previous prime is 43542691. The next prime is 43542743. The reversal of 43542731 is 13724534.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13724534 = 2 ⋅6862267.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43542731 is a prime.

It is a super-2 number, since 2×43542731² = 3791938845876722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 43542694 and 43542703.

It is not an unprimeable number, because it can be changed into a prime (43542781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70610 + ... + 71223.

It is an arithmetic number, because the mean of its divisors is an integer number (10921218).

Almost surely, 2^43542731 is an apocalyptic number.

43542731 is a deficient number, since it is larger than the sum of its proper divisors (142141).

43542731 is a wasteful number, since it uses less digits than its factorization.

43542731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142140.

The product of its digits is 10080, while the sum is 29.

The square root of 43542731 is about 6598.6916127366. The cubic root of 43542731 is about 351.8076035151.

The spelling of 43542731 in words is "forty-three million, five hundred forty-two thousand, seven hundred thirty-one".