999087390 has 96 divisors (see below), whose sum is σ = 2999505600. Its totient is φ = 225994752.

The previous prime is 999087379. The next prime is 999087391. The reversal of 999087390 is 93780999.

It is a happy number.

999087390 is a `hidden beast` number, since 99 + 90 + 87 + 390 = 666.

It is a super-2 number, since 2×999087390² = 1996351225714024200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999087391) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 52936 + ... + 69284.

It is an arithmetic number, because the mean of its divisors is an integer number (31244850).

Almost surely, 2^999087390 is an apocalyptic number.

999087390 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 999087390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1499752800).

999087390 is an abundant number, since it is smaller than the sum of its proper divisors (2000418210).

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

999087390 is a wasteful number, since it uses less digits than its factorization.

999087390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16466 (or 16463 counting only the distinct ones).

The product of its (nonzero) digits is 1102248, while the sum is 54.

The square root of 999087390 is about 31608.3436769471. The cubic root of 999087390 is about 999.6957040801.

The spelling of 999087390 in words is "nine hundred ninety-nine million, eighty-seven thousand, three hundred ninety".