42356731 has 8 divisors (see below), whose sum is σ = 45277344. Its totient is φ = 39526080.

The previous prime is 42356723. The next prime is 42356737. The reversal of 42356731 is 13765324.

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

It is a cyclic number.

It is not a de Polignac number, because 42356731 - 2³ = 42356723 is a prime.

It is a super-2 number, since 2×42356731² = 3588185322012722, 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 = 42356693 and 42356702.

It is not an unprimeable number, because it can be changed into a prime (42356737) 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, 21516 + ... + 23401.

It is an arithmetic number, because the mean of its divisors is an integer number (5659668).

Almost surely, 2^42356731 is an apocalyptic number.

42356731 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

42356731 is a deficient number, since it is larger than the sum of its proper divisors (2920613).

42356731 is a wasteful number, since it uses less digits than its factorization.

42356731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44981.

The product of its digits is 15120, while the sum is 31.

The square root of 42356731 is about 6508.2048984340. The cubic root of 42356731 is about 348.5840234008.

The spelling of 42356731 in words is "forty-two million, three hundred fifty-six thousand, seven hundred thirty-one".