42321757 has 4 divisors (see below), whose sum is σ = 42710140. Its totient is φ = 41933376.

The previous prime is 42321749. The next prime is 42321767. The reversal of 42321757 is 75712324.

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

It can be written as a sum of positive squares in 2 ways, for example, as 38365636 + 3956121 = 6194^2 + 1989^2 .

It is a cyclic number.

It is not a de Polignac number, because 42321757 - 2³ = 42321749 is a prime.

It is a super-2 number, since 2×42321757² = 3582262231134098, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42321767) 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, 194028 + ... + 194245.

It is an arithmetic number, because the mean of its divisors is an integer number (10677535).

Almost surely, 2^42321757 is an apocalyptic number.

It is an amenable number.

42321757 is a deficient number, since it is larger than the sum of its proper divisors (388383).

42321757 is a wasteful number, since it uses less digits than its factorization.

42321757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388382.

The product of its digits is 11760, while the sum is 31.

The square root of 42321757 is about 6505.5174275380. The cubic root of 42321757 is about 348.4880549100.

The spelling of 42321757 in words is "forty-two million, three hundred twenty-one thousand, seven hundred fifty-seven".