1247447445 has 32 divisors (see below), whose sum is σ = 2043975168. Its totient is φ = 649363968.

The previous prime is 1247447393. The next prime is 1247447447. The reversal of 1247447445 is 5447447421.

It is a happy number.

It is not a de Polignac number, because 1247447445 - 2⁶ = 1247447381 is a prime.

It is a super-2 number, since 2×1247447445² = 3112250256074056050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1247447397 and 1247447406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1247447447) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 277657 + ... + 282113.

It is an arithmetic number, because the mean of its divisors is an integer number (63874224).

Almost surely, 2^1247447445 is an apocalyptic number.

1247447445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1247447445 is a deficient number, since it is larger than the sum of its proper divisors (796527723).

1247447445 is a wasteful number, since it uses less digits than its factorization.

1247447445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4909.

The product of its digits is 501760, while the sum is 42.

The square root of 1247447445 is about 35319.2220327685. Note that the first 3 decimals coincide. The cubic root of 1247447445 is about 1076.4836036063.

The spelling of 1247447445 in words is "one billion, two hundred forty-seven million, four hundred forty-seven thousand, four hundred forty-five".