1020801840 has 40 divisors (see below), whose sum is σ = 3164486448. Its totient is φ = 272213760.

The previous prime is 1020801829. The next prime is 1020801853. The reversal of 1020801840 is 481080201.

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 (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1020801840.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2126431 + ... + 2126910.

Almost surely, 2^1020801840 is an apocalyptic number.

1020801840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1020801840 is an abundant number, since it is smaller than the sum of its proper divisors (2143684608).

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

1020801840 is a wasteful number, since it uses less digits than its factorization.

1020801840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4253357 (or 4253351 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 24.

The square root of 1020801840 is about 31949.9896713598. The cubic root of 1020801840 is about 1006.8864150963.

The spelling of 1020801840 in words is "one billion, twenty million, eight hundred one thousand, eight hundred forty".