42724397 has 4 divisors (see below), whose sum is σ = 42776160. Its totient is φ = 42672636.

The previous prime is 42724391. The next prime is 42724421. The reversal of 42724397 is 79342724.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42724397 is a prime.

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 42724397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42724391) 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, 24623 + ... + 26300.

It is an arithmetic number, because the mean of its divisors is an integer number (10694040).

Almost surely, 2^42724397 is an apocalyptic number.

It is an amenable number.

42724397 is a deficient number, since it is larger than the sum of its proper divisors (51763).

42724397 is an equidigital number, since it uses as much as digits as its factorization.

42724397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51762.

The product of its digits is 84672, while the sum is 38.

The square root of 42724397 is about 6536.3902117300. The cubic root of 42724397 is about 349.5897151530.

The spelling of 42724397 in words is "forty-two million, seven hundred twenty-four thousand, three hundred ninety-seven".