1242849945 has 32 divisors (see below), whose sum is σ = 2113994880. Its totient is φ = 621734400.

The previous prime is 1242849913. The next prime is 1242849953. The reversal of 1242849945 is 5499482421.

It is not a de Polignac number, because 1242849945 - 2⁵ = 1242849913 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1242849894 and 1242849903.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7197 + ... + 50373.

It is an arithmetic number, because the mean of its divisors is an integer number (66062340).

Almost surely, 2^1242849945 is an apocalyptic number.

1242849945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1242849945 is the 28785-th pentagonal number.

It is an amenable number.

1242849945 is a deficient number, since it is larger than the sum of its proper divisors (871144935).

1242849945 is a wasteful number, since it uses less digits than its factorization.

1242849945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43305.

The product of its digits is 829440, while the sum is 48.

The square root of 1242849945 is about 35254.0769982707. The cubic root of 1242849945 is about 1075.1595061676.

The spelling of 1242849945 in words is "one billion, two hundred forty-two million, eight hundred forty-nine thousand, nine hundred forty-five".