1605730340 has 12 divisors (see below), whose sum is σ = 3372033756. Its totient is φ = 642292128.

The previous prime is 1605730333. The next prime is 1605730369. The reversal of 1605730340 is 430375061.

It can be written as a sum of positive squares in 2 ways, for example, as 770173504 + 835556836 = 27752^2 + 28906^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40143239 + ... + 40143278.

It is an arithmetic number, because the mean of its divisors is an integer number (281002813).

Almost surely, 2^1605730340 is an apocalyptic number.

1605730340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1605730340 is an abundant number, since it is smaller than the sum of its proper divisors (1766303416).

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

1605730340 is a wasteful number, since it uses less digits than its factorization.

1605730340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80286526 (or 80286524 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 29.

The square root of 1605730340 is about 40071.5652302228. The cubic root of 1605730340 is about 1171.0017329775.

The spelling of 1605730340 in words is "one billion, six hundred five million, seven hundred thirty thousand, three hundred forty".