1245253787 has 16 divisors (see below), whose sum is σ = 1411921920. Its totient is φ = 1092009600.

The previous prime is 1245253781. The next prime is 1245253799. The reversal of 1245253787 is 7873525421.

It is a cyclic number.

It is not a de Polignac number, because 1245253787 - 2¹⁰ = 1245252763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1245253781) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 32414 + ... + 59507.

It is an arithmetic number, because the mean of its divisors is an integer number (88245120).

Almost surely, 2^1245253787 is an apocalyptic number.

1245253787 is a deficient number, since it is larger than the sum of its proper divisors (166668133).

1245253787 is a wasteful number, since it uses less digits than its factorization.

1245253787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91994.

The product of its digits is 470400, while the sum is 44.

The square root of 1245253787 is about 35288.1536354624. The cubic root of 1245253787 is about 1075.8522283283.

The spelling of 1245253787 in words is "one billion, two hundred forty-five million, two hundred fifty-three thousand, seven hundred eighty-seven".