1281172438 has 48 divisors (see below), whose sum is σ = 2394079200. Its totient is φ = 503463168.

The previous prime is 1281172421. The next prime is 1281172457. The reversal of 1281172438 is 8342711821.

It is a junction number, because it is equal to n+sod(n) for n = 1281172397 and 1281172406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 369738 + ... + 373186.

It is an arithmetic number, because the mean of its divisors is an integer number (49876650).

Almost surely, 2^1281172438 is an apocalyptic number.

1281172438 is a deficient number, since it is larger than the sum of its proper divisors (1112906762).

1281172438 is a wasteful number, since it uses less digits than its factorization.

1281172438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3641 (or 3628 counting only the distinct ones).

The product of its digits is 21504, while the sum is 37.

The square root of 1281172438 is about 35793.4692087816. The cubic root of 1281172438 is about 1086.0984544683.

The spelling of 1281172438 in words is "one billion, two hundred eighty-one million, one hundred seventy-two thousand, four hundred thirty-eight".