1285861623 has 16 divisors (see below), whose sum is σ = 1819008000. Its totient is φ = 805182336.

The previous prime is 1285861573. The next prime is 1285861631. The reversal of 1285861623 is 3261685821.

It is not a de Polignac number, because 1285861623 - 2⁶ = 1285861559 is a prime.

It is a super-2 number, since 2×1285861623² = 3306880227008388258, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285861663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 186 + ... + 50712.

It is an arithmetic number, because the mean of its divisors is an integer number (113688000).

Almost surely, 2^1285861623 is an apocalyptic number.

1285861623 is a deficient number, since it is larger than the sum of its proper divisors (533146377).

1285861623 is a wasteful number, since it uses less digits than its factorization.

1285861623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51046.

The product of its digits is 138240, while the sum is 42.

The square root of 1285861623 is about 35858.9127414650. The cubic root of 1285861623 is about 1087.4219077760.

The spelling of 1285861623 in words is "one billion, two hundred eighty-five million, eight hundred sixty-one thousand, six hundred twenty-three".