1247447397 has 16 divisors (see below), whose sum is σ = 1902810752. Its totient is φ = 712100160.

The previous prime is 1247447393. The next prime is 1247447447. The reversal of 1247447397 is 7937447421.

It is not a de Polignac number, because 1247447397 - 2² = 1247447393 is a prime.

It is a super-2 number, since 2×1247447397² = 3112250016564151218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1247447393) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8854 + ... + 50727.

It is an arithmetic number, because the mean of its divisors is an integer number (118925672).

Almost surely, 2^1247447397 is an apocalyptic number.

It is an amenable number.

1247447397 is a deficient number, since it is larger than the sum of its proper divisors (655363355).

1247447397 is an equidigital number, since it uses as much as digits as its factorization.

1247447397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60588.

The product of its digits is 1185408, while the sum is 48.

The square root of 1247447397 is about 35319.2213532518. The cubic root of 1247447397 is about 1076.4835897991.

The spelling of 1247447397 in words is "one billion, two hundred forty-seven million, four hundred forty-seven thousand, three hundred ninety-seven".