1285138168 has 32 divisors (see below), whose sum is σ = 2487434400. Its totient is φ = 622000512.

The previous prime is 1285138157. The next prime is 1285138181. The reversal of 1285138168 is 8618315821.

It is a super-2 number, since 2×1285138168² = 3303160221700792448, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47293 + ... + 69331.

It is an arithmetic number, because the mean of its divisors is an integer number (77732325).

Almost surely, 2^1285138168 is an apocalyptic number.

It is an amenable number.

1285138168 is a deficient number, since it is larger than the sum of its proper divisors (1202296232).

1285138168 is a wasteful number, since it uses less digits than its factorization.

1285138168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22279 (or 22275 counting only the distinct ones).

The product of its digits is 92160, while the sum is 43.

The square root of 1285138168 is about 35848.8238021835. The cubic root of 1285138168 is about 1087.2179334169.

The spelling of 1285138168 in words is "one billion, two hundred eighty-five million, one hundred thirty-eight thousand, one hundred sixty-eight".