1281861072 has 40 divisors (see below), whose sum is σ = 3679417280. Its totient is φ = 427286880.

The previous prime is 1281861071. The next prime is 1281861083. The reversal of 1281861072 is 2701681821.

1281861072 is a `hidden beast` number, since 1 + 28 + 18 + 610 + 7 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281861071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1483204 + ... + 1484067.

It is an arithmetic number, because the mean of its divisors is an integer number (91985432).

Almost surely, 2^1281861072 is an apocalyptic number.

1281861072 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1281861072 is an abundant number, since it is smaller than the sum of its proper divisors (2397556208).

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

1281861072 is a wasteful number, since it uses less digits than its factorization.

1281861072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2967288 (or 2967276 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 36.

The square root of 1281861072 is about 35803.0874646308. The cubic root of 1281861072 is about 1086.2930133315.

The spelling of 1281861072 in words is "one billion, two hundred eighty-one million, eight hundred sixty-one thousand, seventy-two".