1091856406000 has 40 divisors (see below), whose sum is σ = 2640108794544. Its totient is φ = 436742561600.

The previous prime is 1091856405977. The next prime is 1091856406001. The reversal of 1091856406000 is 6046581901.

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

It is a super-2 number, since 2×1091856406000² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091856406001) 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, 272962102 + ... + 272966101.

Almost surely, 2^{1091856406000} is an apocalyptic number.

1091856406000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1091856406000 is an abundant number, since it is smaller than the sum of its proper divisors (1548252388544).

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

1091856406000 is an equidigital number, since it uses as much as digits as its factorization.

1091856406000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545928226 (or 545928210 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 40.

The spelling of 1091856406000 in words is "one trillion, ninety-one billion, eight hundred fifty-six million, four hundred six thousand".