42132731 has 4 divisors (see below), whose sum is σ = 42148200. Its totient is φ = 42117264.

The previous prime is 42132719. The next prime is 42132763. The reversal of 42132731 is 13723124.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42132731 is a prime.

It is a super-2 number, since 2×42132731² = 3550334043036722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42132697 and 42132706.

It is not an unprimeable number, because it can be changed into a prime (42132781) 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, 2441 + ... + 9498.

It is an arithmetic number, because the mean of its divisors is an integer number (10537050).

Almost surely, 2^42132731 is an apocalyptic number.

42132731 is a deficient number, since it is larger than the sum of its proper divisors (15469).

42132731 is a wasteful number, since it uses less digits than its factorization.

42132731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15468.

The product of its digits is 1008, while the sum is 23.

The square root of 42132731 is about 6490.9730395373. The cubic root of 42132731 is about 347.9684512510.

Adding to 42132731 its reverse (13723124), we get a palindrome (55855855).

The spelling of 42132731 in words is "forty-two million, one hundred thirty-two thousand, seven hundred thirty-one".