42303731 has 2 divisors, whose sum is σ = 42303732. Its totient is φ = 42303730.

The previous prime is 42303727. The next prime is 42303757. The reversal of 42303731 is 13730324.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42303731 - 2² = 42303727 is a prime.

It is a super-2 number, since 2×42303731² = 3579211313040722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 42303697 and 42303706.

It is not a weakly prime, because it can be changed into another prime (42303031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21151865 + 21151866.

It is an arithmetic number, because the mean of its divisors is an integer number (21151866).

Almost surely, 2^42303731 is an apocalyptic number.

42303731 is a deficient number, since it is larger than the sum of its proper divisors (1).

42303731 is an equidigital number, since it uses as much as digits as its factorization.

42303731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 23.

The square root of 42303731 is about 6504.1318406072. The cubic root of 42303731 is about 348.4385710022.

It can be divided in two parts, 42303 and 731, that added together give a palindrome (43034).

The spelling of 42303731 in words is "forty-two million, three hundred three thousand, seven hundred thirty-one".