1002143640 has 64 divisors (see below), whose sum is σ = 3015473760. Its totient is φ = 266434560.

The previous prime is 1002143627. The next prime is 1002143651. The reversal of 1002143640 is 463412001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28050 + ... + 52830.

Almost surely, 2^1002143640 is an apocalyptic number.

1002143640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1002143640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1507736880).

1002143640 is an abundant number, since it is smaller than the sum of its proper divisors (2013330120).

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

1002143640 is a wasteful number, since it uses less digits than its factorization.

1002143640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25132 (or 25128 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 1002143640 is about 31656.6523814506. The cubic root of 1002143640 is about 1000.7140366969.

Adding to 1002143640 its reverse (463412001), we get a palindrome (1465555641).

The spelling of 1002143640 in words is "one billion, two million, one hundred forty-three thousand, six hundred forty".