42992309 has 2 divisors, whose sum is σ = 42992310. Its totient is φ = 42992308.

The previous prime is 42992293. The next prime is 42992317. The reversal of 42992309 is 90329924.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29669809 + 13322500 = 5447^2 + 3650^2 .

It is a cyclic number.

It is not a de Polignac number, because 42992309 - 2⁴ = 42992293 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42992809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21496154 + 21496155.

It is an arithmetic number, because the mean of its divisors is an integer number (21496155).

Almost surely, 2^42992309 is an apocalyptic number.

It is an amenable number.

42992309 is a deficient number, since it is larger than the sum of its proper divisors (1).

42992309 is an equidigital number, since it uses as much as digits as its factorization.

42992309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 38.

The square root of 42992309 is about 6556.8520648250. The cubic root of 42992309 is about 350.3189174797.

The spelling of 42992309 in words is "forty-two million, nine hundred ninety-two thousand, three hundred nine".