1020000399 has 16 divisors (see below), whose sum is σ = 1491177600. Its totient is φ = 615040160.

The previous prime is 1020000367. The next prime is 1020000403. The reversal of 1020000399 is 9930000201.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1020000399 - 2⁵ = 1020000367 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020000329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71949 + ... + 84950.

It is an arithmetic number, because the mean of its divisors is an integer number (93198600).

Almost surely, 2^1020000399 is an apocalyptic number.

1020000399 is a deficient number, since it is larger than the sum of its proper divisors (471177201).

1020000399 is a wasteful number, since it uses less digits than its factorization.

1020000399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157110.

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

The square root of 1020000399 is about 31937.4450919293. The cubic root of 1020000399 is about 1006.6228408158.

The spelling of 1020000399 in words is "one billion, twenty million, three hundred ninety-nine", and thus it is an aban number.