42970409 has 2 divisors, whose sum is σ = 42970410. Its totient is φ = 42970408.

The previous prime is 42970399. The next prime is 42970453. The reversal of 42970409 is 90407924.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41319184 + 1651225 = 6428^2 + 1285^2 .

It is a cyclic number.

It is not a de Polignac number, because 42970409 - 2⁴ = 42970393 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42972409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21485204 + 21485205.

It is an arithmetic number, because the mean of its divisors is an integer number (21485205).

Almost surely, 2^42970409 is an apocalyptic number.

It is an amenable number.

42970409 is a deficient number, since it is larger than the sum of its proper divisors (1).

42970409 is an equidigital number, since it uses as much as digits as its factorization.

42970409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 42970409 is about 6555.1818433969. The cubic root of 42970409 is about 350.2594239910.

The spelling of 42970409 in words is "forty-two million, nine hundred seventy thousand, four hundred nine".