1285564023 has 12 divisors (see below), whose sum is σ = 1870481808. Its totient is φ = 850786080.

The previous prime is 1285563967. The next prime is 1285564043. The reversal of 1285564023 is 3204655821.

1285564023 is a `hidden beast` number, since 1 + 2 + 8 + 5 + 5 + 640 + 2 + 3 = 666.

It is not a de Polignac number, because 1285564023 - 2¹² = 1285559927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285564043) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 520083 + ... + 522548.

It is an arithmetic number, because the mean of its divisors is an integer number (155873484).

Almost surely, 2^1285564023 is an apocalyptic number.

1285564023 is a deficient number, since it is larger than the sum of its proper divisors (584917785).

1285564023 is a wasteful number, since it uses less digits than its factorization.

1285564023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1042774 (or 1042771 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The square root of 1285564023 is about 35854.7629053659. The cubic root of 1285564023 is about 1087.3380102753.

The spelling of 1285564023 in words is "one billion, two hundred eighty-five million, five hundred sixty-four thousand, twenty-three".