1286211920 has 40 divisors (see below), whose sum is σ = 3417650304. Its totient is φ = 440986752.

The previous prime is 1286211919. The next prime is 1286211989. The reversal of 1286211920 is 291126821.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×1286211920² = 3308682206300172800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1147844 + ... + 1148963.

Almost surely, 2^1286211920 is an apocalyptic number.

1286211920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1286211920 is an abundant number, since it is smaller than the sum of its proper divisors (2131438384).

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

1286211920 is a wasteful number, since it uses less digits than its factorization.

1286211920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2296827 (or 2296821 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 1286211920 is about 35863.7967872895. The cubic root of 1286211920 is about 1087.5206446955.

The spelling of 1286211920 in words is "one billion, two hundred eighty-six million, two hundred eleven thousand, nine hundred twenty".