1305640534 has 32 divisors (see below), whose sum is σ = 2216110752. Its totient is φ = 571680000.

The previous prime is 1305640507. The next prime is 1305640541. The reversal of 1305640534 is 4350465031.

It is a junction number, because it is equal to n+sod(n) for n = 1305640496 and 1305640505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74274 + ... + 90154.

It is an arithmetic number, because the mean of its divisors is an integer number (69253461).

Almost surely, 2^1305640534 is an apocalyptic number.

1305640534 is a deficient number, since it is larger than the sum of its proper divisors (910470218).

1305640534 is a wasteful number, since it uses less digits than its factorization.

1305640534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16032.

The product of its (nonzero) digits is 21600, while the sum is 31.

The square root of 1305640534 is about 36133.6482243352. The cubic root of 1305640534 is about 1092.9690770719.

The spelling of 1305640534 in words is "one billion, three hundred five million, six hundred forty thousand, five hundred thirty-four".