42215723 has 16 divisors (see below), whose sum is σ = 47520000. Its totient is φ = 37171680.

The previous prime is 42215713. The next prime is 42215731. The reversal of 42215723 is 32751224.

It is a cyclic number.

It is not a de Polignac number, because 42215723 - 2⁶ = 42215659 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42215692 and 42215701.

It is not an unprimeable number, because it can be changed into a prime (42215713) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70178 + ... + 70776.

It is an arithmetic number, because the mean of its divisors is an integer number (2970000).

Almost surely, 2^42215723 is an apocalyptic number.

42215723 is a gapful number since it is divisible by the number (43) formed by its first and last digit.

42215723 is a deficient number, since it is larger than the sum of its proper divisors (5304277).

42215723 is a wasteful number, since it uses less digits than its factorization.

42215723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 802.

The product of its digits is 3360, while the sum is 26.

The square root of 42215723 is about 6497.3627726948. The cubic root of 42215723 is about 348.1967745862.

Adding to 42215723 its reverse (32751224), we get a palindrome (74966947).

The spelling of 42215723 in words is "forty-two million, two hundred fifteen thousand, seven hundred twenty-three".