1020002540 has 12 divisors (see below), whose sum is σ = 2142005376. Its totient is φ = 408001008.

The previous prime is 1020002519. The next prime is 1020002563. The reversal of 1020002540 is 452000201.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 25500044 + ... + 25500083.

It is an arithmetic number, because the mean of its divisors is an integer number (178500448).

Almost surely, 2^1020002540 is an apocalyptic number.

1020002540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1020002540 is an abundant number, since it is smaller than the sum of its proper divisors (1122002836).

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

1020002540 is a wasteful number, since it uses less digits than its factorization.

1020002540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51000136 (or 51000134 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 1020002540 is about 31937.4786105604. The cubic root of 1020002540 is about 1006.6235451221.

Adding to 1020002540 its reverse (452000201), we get a palindrome (1472002741).

The spelling of 1020002540 in words is "one billion, twenty million, two thousand, five hundred forty".