1002399990 has 16 divisors (see below), whose sum is σ = 2405760048. Its totient is φ = 267306656.

The previous prime is 1002399949. The next prime is 1002399991. The reversal of 1002399990 is 999932001.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1002399991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16706637 + ... + 16706696.

It is an arithmetic number, because the mean of its divisors is an integer number (150360003).

Almost surely, 2^1002399990 is an apocalyptic number.

1002399990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1002399990 is an abundant number, since it is smaller than the sum of its proper divisors (1403360058).

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

1002399990 is a wasteful number, since it uses less digits than its factorization.

1002399990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33413343.

The product of its (nonzero) digits is 39366, while the sum is 42.

The square root of 1002399990 is about 31660.7010345633. The cubic root of 1002399990 is about 1000.7993575240.

The spelling of 1002399990 in words is "one billion, two million, three hundred ninety-nine thousand, nine hundred ninety".