1020001040 has 40 divisors (see below), whose sum is σ = 2393686080. Its totient is φ = 404183936.

The previous prime is 1020001039. The next prime is 1020001051. The reversal of 1020001040 is 401000201.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51020 + ... + 68139.

It is an arithmetic number, because the mean of its divisors is an integer number (59842152).

Almost surely, 2^1020001040 is an apocalyptic number.

1020001040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1020001040 is an abundant number, since it is smaller than the sum of its proper divisors (1373685040).

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

1020001040 is a wasteful number, since it uses less digits than its factorization.

1020001040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119279 (or 119273 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 1020001040 is about 31937.4551271700. The cubic root of 1020001040 is about 1006.6230516801.

Adding to 1020001040 its reverse (401000201), we get a palindrome (1421001241).

The spelling of 1020001040 in words is "one billion, twenty million, one thousand, forty".