1272782145 has 8 divisors (see below), whose sum is σ = 2036451456. Its totient is φ = 678817136.

The previous prime is 1272782143. The next prime is 1272782237. The reversal of 1272782145 is 5412872721.

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

It is a cyclic number.

It is not a de Polignac number, because 1272782145 - 2¹ = 1272782143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1272782143) 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, 42426057 + ... + 42426086.

It is an arithmetic number, because the mean of its divisors is an integer number (254556432).

Almost surely, 2^1272782145 is an apocalyptic number.

1272782145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1272782145 is a deficient number, since it is larger than the sum of its proper divisors (763669311).

1272782145 is an equidigital number, since it uses as much as digits as its factorization.

1272782145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84852151.

The product of its digits is 62720, while the sum is 39.

The square root of 1272782145 is about 35676.0724435861. The cubic root of 1272782145 is about 1083.7223367233.

The spelling of 1272782145 in words is "one billion, two hundred seventy-two million, seven hundred eighty-two thousand, one hundred forty-five".