1281438445 has 24 divisors (see below), whose sum is σ = 1866564864. Its totient is φ = 840492576.

The previous prime is 1281438443. The next prime is 1281438467. The reversal of 1281438445 is 5448341821.

It is not a de Polignac number, because 1281438445 - 2¹ = 1281438443 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1281438398 and 1281438407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281438443) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 108069 + ... + 119338.

It is an arithmetic number, because the mean of its divisors is an integer number (77773536).

Almost surely, 2^1281438445 is an apocalyptic number.

It is an amenable number.

1281438445 is a deficient number, since it is larger than the sum of its proper divisors (585126419).

1281438445 is a wasteful number, since it uses less digits than its factorization.

1281438445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227449 (or 227442 counting only the distinct ones).

The product of its digits is 122880, while the sum is 40.

The square root of 1281438445 is about 35797.1848753502. The cubic root of 1281438445 is about 1086.1736173400.

The spelling of 1281438445 in words is "one billion, two hundred eighty-one million, four hundred thirty-eight thousand, four hundred forty-five".