1581358340 has 24 divisors (see below), whose sum is σ = 3322105920. Its totient is φ = 632304608.

The previous prime is 1581358301. The next prime is 1581358349. The reversal of 1581358340 is 438531851.

It is a junction number, because it is equal to n+sod(n) for n = 1581358294 and 1581358303.

It is not an unprimeable number, because it can be changed into a prime (1581358349) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 45329 + ... + 72231.

It is an arithmetic number, because the mean of its divisors is an integer number (138421080).

Almost surely, 2^1581358340 is an apocalyptic number.

1581358340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1581358340 is an abundant number, since it is smaller than the sum of its proper divisors (1740747580).

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

1581358340 is a wasteful number, since it uses less digits than its factorization.

1581358340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29851 (or 29849 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 38.

The square root of 1581358340 is about 39766.2965336225. The cubic root of 1581358340 is about 1165.0469603523.

The spelling of 1581358340 in words is "one billion, five hundred eighty-one million, three hundred fifty-eight thousand, three hundred forty".