1009781405 has 8 divisors (see below), whose sum is σ = 1220988384. Its totient is φ = 801658000.

The previous prime is 1009781359. The next prime is 1009781407. The reversal of 1009781405 is 5041879001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1009781405 - 2¹⁰ = 1009780381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1009781407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 770171 + ... + 771480.

It is an arithmetic number, because the mean of its divisors is an integer number (152623548).

Almost surely, 2^1009781405 is an apocalyptic number.

It is an amenable number.

1009781405 is a deficient number, since it is larger than the sum of its proper divisors (211206979).

1009781405 is a wasteful number, since it uses less digits than its factorization.

1009781405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1541787.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 1009781405 is about 31777.0578405239. The cubic root of 1009781405 is about 1003.2498950737.

The spelling of 1009781405 in words is "one billion, nine million, seven hundred eighty-one thousand, four hundred five".