10020399 has 16 divisors (see below), whose sum is σ = 13932000. Its totient is φ = 6398336.

The previous prime is 10020397. The next prime is 10020401. The reversal of 10020399 is 99302001.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (10020397) and next prime (10020401).

It is a cyclic number.

It is not a de Polignac number, because 10020399 - 2¹ = 10020397 is a prime.

It is a super-3 number, since 3×10020399³ (a number of 22 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10020397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12577 + ... + 13349.

It is an arithmetic number, because the mean of its divisors is an integer number (870750).

Almost surely, 2^10020399 is an apocalyptic number.

10020399 is a deficient number, since it is larger than the sum of its proper divisors (3911601).

10020399 is a wasteful number, since it uses less digits than its factorization.

10020399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 954.

The product of its (nonzero) digits is 486, while the sum is 24.

The square root of 10020399 is about 3165.5013820878. The cubic root of 10020399 is about 215.5898638821.

The spelling of 10020399 in words is "ten million, twenty thousand, three hundred ninety-nine".