42312409 has 2 divisors, whose sum is σ = 42312410. Its totient is φ = 42312408.

The previous prime is 42312377. The next prime is 42312419. The reversal of 42312409 is 90421324.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22705225 + 19607184 = 4765^2 + 4428^2 .

It is a cyclic number.

It is not a de Polignac number, because 42312409 - 2⁵ = 42312377 is a prime.

It is not a weakly prime, because it can be changed into another prime (42312419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21156204 + 21156205.

It is an arithmetic number, because the mean of its divisors is an integer number (21156205).

Almost surely, 2^42312409 is an apocalyptic number.

It is an amenable number.

42312409 is a deficient number, since it is larger than the sum of its proper divisors (1).

42312409 is an equidigital number, since it uses as much as digits as its factorization.

42312409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 42312409 is about 6504.7989207969. The cubic root of 42312409 is about 348.4623950883.

It can be divided in two parts, 4231240 and 9, that added together give a square (4231249 = 2057²).

The spelling of 42312409 in words is "forty-two million, three hundred twelve thousand, four hundred nine".