1000399512 has 256 divisors, whose sum is σ = 3108372480. Its totient is φ = 262310400.

The previous prime is 1000399511. The next prime is 1000399523. The reversal of 1000399512 is 2159930001.

It is a self number, because there is not a number n which added to its sum of digits gives 1000399512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000399511) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 14931303 + ... + 14931369.

It is an arithmetic number, because the mean of its divisors is an integer number (12142080).

Almost surely, 2^1000399512 is an apocalyptic number.

1000399512 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1000399512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1554186240).

1000399512 is an abundant number, since it is smaller than the sum of its proper divisors (2107972968).

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

1000399512 is a wasteful number, since it uses less digits than its factorization.

1000399512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222 (or 218 counting only the distinct ones).

The product of its (nonzero) digits is 2430, while the sum is 30.

The square root of 1000399512 is about 31629.0928102594. The cubic root of 1000399512 is about 1000.1331529362.

The spelling of 1000399512 in words is "one billion, three hundred ninety-nine thousand, five hundred twelve".