1281437420 has 48 divisors (see below), whose sum is σ = 2724321600. Its totient is φ = 506259456.

The previous prime is 1281437419. The next prime is 1281437429. The reversal of 1281437420 is 247341821.

It is a super-2 number, since 2×1281437420² = 3284163722752512800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1281437429) 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, 1221056 + ... + 1222104.

It is an arithmetic number, because the mean of its divisors is an integer number (56756700).

Almost surely, 2^1281437420 is an apocalyptic number.

1281437420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1281437420 is an abundant number, since it is smaller than the sum of its proper divisors (1442884180).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1281437420 is a wasteful number, since it uses less digits than its factorization.

1281437420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1754 (or 1752 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 1281437420 is about 35797.1705585791. The cubic root of 1281437420 is about 1086.1733277362.

The spelling of 1281437420 in words is "one billion, two hundred eighty-one million, four hundred thirty-seven thousand, four hundred twenty".