42300781 has 4 divisors (see below), whose sum is σ = 42372000. Its totient is φ = 42229564.

The previous prime is 42300767. The next prime is 42300803. The reversal of 42300781 is 18700324.

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 not a de Polignac number, because 42300781 - 2¹³ = 42292589 is a prime.

It is a super-2 number, since 2×42300781² = 3578712146419922, 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 (42300751) 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, 34711 + ... + 35908.

It is an arithmetic number, because the mean of its divisors is an integer number (10593000).

Almost surely, 2^42300781 is an apocalyptic number.

It is an amenable number.

42300781 is a deficient number, since it is larger than the sum of its proper divisors (71219).

42300781 is an equidigital number, since it uses as much as digits as its factorization.

42300781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71218.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 42300781 is about 6503.9050577326. The cubic root of 42300781 is about 348.4304714985.

The spelling of 42300781 in words is "forty-two million, three hundred thousand, seven hundred eighty-one".