10399820 has 24 divisors (see below), whose sum is σ = 21918624. Its totient is φ = 4144896.

The previous prime is 10399811. The next prime is 10399843. The reversal of 10399820 is 2899301.

It is a nialpdrome in base 15.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5969 + ... + 7511.

It is an arithmetic number, because the mean of its divisors is an integer number (913276).

Almost surely, 2^10399820 is an apocalyptic number.

10399820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10399820 is an abundant number, since it is smaller than the sum of its proper divisors (11518804).

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

10399820 is a wasteful number, since it uses less digits than its factorization.

10399820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1889 (or 1887 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 10399820 is about 3224.8751913834. The cubic root of 10399820 is about 218.2773173055.

The spelling of 10399820 in words is "ten million, three hundred ninety-nine thousand, eight hundred twenty".