42702721 has 2 divisors, whose sum is σ = 42702722. Its totient is φ = 42702720.

The previous prime is 42702713. The next prime is 42702731. The reversal of 42702721 is 12720724.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40640625 + 2062096 = 6375^2 + 1436^2 .

It is a cyclic number.

It is not a de Polignac number, because 42702721 - 2³ = 42702713 is a prime.

It is not a weakly prime, because it can be changed into another prime (42702701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21351360 + 21351361.

It is an arithmetic number, because the mean of its divisors is an integer number (21351361).

Almost surely, 2^42702721 is an apocalyptic number.

It is an amenable number.

42702721 is a deficient number, since it is larger than the sum of its proper divisors (1).

42702721 is an equidigital number, since it uses as much as digits as its factorization.

42702721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1568, while the sum is 25.

The square root of 42702721 is about 6534.7318996268. The cubic root of 42702721 is about 349.5305843124.

The spelling of 42702721 in words is "forty-two million, seven hundred two thousand, seven hundred twenty-one".