1002021690 has 64 divisors (see below), whose sum is σ = 2466680832. Its totient is φ = 260366400.

The previous prime is 1002021689. The next prime is 1002021731. The reversal of 1002021690 is 961202001.

It is a super-2 number, since 2×1002021690² = 2008094934460912200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 813375 + ... + 814605.

It is an arithmetic number, because the mean of its divisors is an integer number (38541888).

Almost surely, 2^1002021690 is an apocalyptic number.

1002021690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1002021690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1233340416).

1002021690 is an abundant number, since it is smaller than the sum of its proper divisors (1464659142).

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

1002021690 is a wasteful number, since it uses less digits than its factorization.

1002021690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1915.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 1002021690 is about 31654.7261874116. The cubic root of 1002021690 is about 1000.6734430393.

Adding to 1002021690 its reverse (961202001), we get a palindrome (1963223691).

The spelling of 1002021690 in words is "one billion, two million, twenty-one thousand, six hundred ninety".