1020390740 has 24 divisors (see below), whose sum is σ = 2157208200. Its totient is φ = 405415808.

The previous prime is 1020390733. The next prime is 1020390803. The reversal of 1020390740 is 470930201.

It can be written as a sum of positive squares in 4 ways, for example, as 46076944 + 974313796 = 6788^2 + 31214^2 .

It is a congruent number.

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, 168227 + ... + 174186.

It is an arithmetic number, because the mean of its divisors is an integer number (89883675).

Almost surely, 2^1020390740 is an apocalyptic number.

1020390740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1020390740 is an abundant number, since it is smaller than the sum of its proper divisors (1136817460).

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

1020390740 is a wasteful number, since it uses less digits than its factorization.

1020390740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342571 (or 342569 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 1020390740 is about 31943.5555315935. Note that the first 4 decimals coincide. The cubic root of 1020390740 is about 1006.7512316330.

The spelling of 1020390740 in words is "one billion, twenty million, three hundred ninety thousand, seven hundred forty".