1089405972 has 36 divisors (see below), whose sum is σ = 2800455840. Its totient is φ = 356979792.

The previous prime is 1089405949. The next prime is 1089405991. The reversal of 1089405972 is 2795049801.

1089405972 is a `hidden beast` number, since 10 + 8 + 9 + 40 + 597 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

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 11 ways as a sum of consecutive naturals, for example, 254328 + ... + 258575.

It is an arithmetic number, because the mean of its divisors is an integer number (77790440).

Almost surely, 2^1089405972 is an apocalyptic number.

1089405972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1089405972 is an abundant number, since it is smaller than the sum of its proper divisors (1711049868).

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

1089405972 is a wasteful number, since it uses less digits than its factorization.

1089405972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512972 (or 512967 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The square root of 1089405972 is about 33006.1505177444. The cubic root of 1089405972 is about 1028.9554786416.

The spelling of 1089405972 in words is "one billion, eighty-nine million, four hundred five thousand, nine hundred seventy-two".