1242140945 has 4 divisors (see below), whose sum is σ = 1490569140. Its totient is φ = 993712752.

The previous prime is 1242140929. The next prime is 1242140947. The reversal of 1242140945 is 5490412421.

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 228100609 + 1014040336 = 15103^2 + 31844^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242140945 - 2⁴ = 1242140929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1242140947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124214090 + ... + 124214099.

It is an arithmetic number, because the mean of its divisors is an integer number (372642285).

Almost surely, 2^1242140945 is an apocalyptic number.

It is an amenable number.

1242140945 is a deficient number, since it is larger than the sum of its proper divisors (248428195).

1242140945 is an equidigital number, since it uses as much as digits as its factorization.

1242140945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248428194.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 1242140945 is about 35244.0199892124. The cubic root of 1242140945 is about 1074.9550210133.

The spelling of 1242140945 in words is "one billion, two hundred forty-two million, one hundred forty thousand, nine hundred forty-five".