999997040 has 40 divisors (see below), whose sum is σ = 2657136480. Its totient is φ = 342855936.

The previous prime is 999997021. The next prime is 999997049. The reversal of 999997040 is 40799999.

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

It is a Harshad number since it is a multiple of its sum of digits (56).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999997049) 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, 892295 + ... + 893414.

It is an arithmetic number, because the mean of its divisors is an integer number (66428412).

Almost surely, 2^999997040 is an apocalyptic number.

It is an amenable number.

999997040 is an abundant number, since it is smaller than the sum of its proper divisors (1657139440).

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

999997040 is a wasteful number, since it uses less digits than its factorization.

999997040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1785729 (or 1785723 counting only the distinct ones).

The product of its (nonzero) digits is 1653372, while the sum is 56.

The square root of 999997040 is about 31622.7297999398. The cubic root of 999997040 is about 999.9990133324. Note that the first 3 decimals are identical.

The spelling of 999997040 in words is "nine hundred ninety-nine million, nine hundred ninety-seven thousand, forty".