42356971 has 4 divisors (see below), whose sum is σ = 43501792. Its totient is φ = 41212152.

The previous prime is 42356957. The next prime is 42356983. The reversal of 42356971 is 17965324.

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

It is a cyclic number.

It is not a de Polignac number, because 42356971 - 2¹⁹ = 41832683 is a prime.

It is a super-2 number, since 2×42356971² = 3588225984589682, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 1144783 = 42356971 / (4 + 2 + 3 + 5 + 6 + 9 + 7 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42356971.

It is not an unprimeable number, because it can be changed into a prime (42356921) 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, 572355 + ... + 572428.

It is an arithmetic number, because the mean of its divisors is an integer number (10875448).

Almost surely, 2^42356971 is an apocalyptic number.

42356971 is a deficient number, since it is larger than the sum of its proper divisors (1144821).

42356971 is a wasteful number, since it uses less digits than its factorization.

42356971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1144820.

The product of its digits is 45360, while the sum is 37.

The square root of 42356971 is about 6508.2233366718. The cubic root of 42356971 is about 348.5846817772.

The spelling of 42356971 in words is "forty-two million, three hundred fifty-six thousand, nine hundred seventy-one".