40412120909 has 18 divisors (see below), whose sum is σ = 41482000458. Its totient is φ = 39365904000.

The previous prime is 40412120899. The next prime is 40412120929. The reversal of 40412120909 is 90902121404.

It can be written as a sum of positive squares in 3 ways, for example, as 26735520100 + 13676600809 = 163510^2 + 116947^2 .

It is not a de Polignac number, because 40412120909 - 2⁸ = 40412120653 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40412120929) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 167685029 + ... + 167685269.

It is an arithmetic number, because the mean of its divisors is an integer number (2304555581).

Almost surely, 2^40412120909 is an apocalyptic number.

It is an amenable number.

40412120909 is a deficient number, since it is larger than the sum of its proper divisors (1069879549).

40412120909 is an frugal number, since it uses more digits than its factorization.

40412120909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 749 (or 425 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 32.

The spelling of 40412120909 in words is "forty billion, four hundred twelve million, one hundred twenty thousand, nine hundred nine".