1247899245 has 8 divisors (see below), whose sum is σ = 1996638816. Its totient is φ = 665546256.

The previous prime is 1247899241. The next prime is 1247899267. The reversal of 1247899245 is 5429987421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1247899245 - 2² = 1247899241 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1247899241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41596627 + ... + 41596656.

It is an arithmetic number, because the mean of its divisors is an integer number (249579852).

Almost surely, 2^1247899245 is an apocalyptic number.

1247899245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1247899245 is a deficient number, since it is larger than the sum of its proper divisors (748739571).

1247899245 is an equidigital number, since it uses as much as digits as its factorization.

1247899245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83193291.

The product of its digits is 1451520, while the sum is 51.

The square root of 1247899245 is about 35325.6174043710. The cubic root of 1247899245 is about 1076.6135480487.

The spelling of 1247899245 in words is "one billion, two hundred forty-seven million, eight hundred ninety-nine thousand, two hundred forty-five".