1242085945 has 4 divisors (see below), whose sum is σ = 1490503140. Its totient is φ = 993668752.

The previous prime is 1242085937. The next prime is 1242085969. The reversal of 1242085945 is 5495802421.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 365689129 + 876396816 = 19123^2 + 29604^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242085945 - 2³ = 1242085937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1242085898 and 1242085907.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124208590 + ... + 124208599.

It is an arithmetic number, because the mean of its divisors is an integer number (372625785).

Almost surely, 2^1242085945 is an apocalyptic number.

It is an amenable number.

1242085945 is a deficient number, since it is larger than the sum of its proper divisors (248417195).

1242085945 is an equidigital number, since it uses as much as digits as its factorization.

1242085945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248417194.

The product of its (nonzero) digits is 115200, while the sum is 40.

The square root of 1242085945 is about 35243.2397063607. The cubic root of 1242085945 is about 1074.9391550203.

The spelling of 1242085945 in words is "one billion, two hundred forty-two million, eighty-five thousand, nine hundred forty-five".