1009865397 has 8 divisors (see below), whose sum is σ = 1346637600. Its totient is φ = 673168400.

The previous prime is 1009865317. The next prime is 1009865471. The reversal of 1009865397 is 7935689001.

1009865397 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1009865397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1009865317) 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, 32647 + ... + 55547.

It is an arithmetic number, because the mean of its divisors is an integer number (168329700).

Almost surely, 2^1009865397 is an apocalyptic number.

It is an amenable number.

1009865397 is a deficient number, since it is larger than the sum of its proper divisors (336772203).

1009865397 is a wasteful number, since it uses less digits than its factorization.

1009865397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37603.

The product of its (nonzero) digits is 408240, while the sum is 48.

The square root of 1009865397 is about 31778.3793954317. The cubic root of 1009865397 is about 1003.2777105424.

The spelling of 1009865397 in words is "one billion, nine million, eight hundred sixty-five thousand, three hundred ninety-seven".