42747731 has 8 divisors (see below), whose sum is σ = 48037920. Its totient is φ = 37743552.

The previous prime is 42747713. The next prime is 42747743. The reversal of 42747731 is 13774724.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42747731 - 2¹⁴ = 42731347 is a prime.

It is a super-2 number, since 2×42747731² = 3654737011296722, 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 = 42747691 and 42747700.

It is not an unprimeable number, because it can be changed into a prime (42747631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71186 + ... + 71783.

It is an arithmetic number, because the mean of its divisors is an integer number (6004740).

Almost surely, 2^42747731 is an apocalyptic number.

42747731 is a deficient number, since it is larger than the sum of its proper divisors (5290189).

42747731 is a wasteful number, since it uses less digits than its factorization.

42747731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143005.

The product of its digits is 32928, while the sum is 35.

The square root of 42747731 is about 6538.1748982419. The cubic root of 42747731 is about 349.6533465704.

The spelling of 42747731 in words is "forty-two million, seven hundred forty-seven thousand, seven hundred thirty-one".