42463721 has 2 divisors, whose sum is σ = 42463722. Its totient is φ = 42463720.

The previous prime is 42463711. The next prime is 42463723. The reversal of 42463721 is 12736424.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42445225 + 18496 = 6515^2 + 136^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42463721 is a prime.

Together with 42463723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42463723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21231860 + 21231861.

It is an arithmetic number, because the mean of its divisors is an integer number (21231861).

Almost surely, 2^42463721 is an apocalyptic number.

It is an amenable number.

42463721 is a deficient number, since it is larger than the sum of its proper divisors (1).

42463721 is an equidigital number, since it uses as much as digits as its factorization.

42463721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 29.

The square root of 42463721 is about 6516.4193388701. The cubic root of 42463721 is about 348.8772758646.

The spelling of 42463721 in words is "forty-two million, four hundred sixty-three thousand, seven hundred twenty-one".