1285139955 has 32 divisors (see below), whose sum is σ = 2361219840. Its totient is φ = 590302080.

The previous prime is 1285139953. The next prime is 1285140047. The reversal of 1285139955 is 5599315821.

It is not a de Polignac number, because 1285139955 - 2¹ = 1285139953 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1285139953) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 201832 + ... + 208101.

It is an arithmetic number, because the mean of its divisors is an integer number (73788120).

Almost surely, 2^1285139955 is an apocalyptic number.

1285139955 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1285139955 is a deficient number, since it is larger than the sum of its proper divisors (1076079885).

1285139955 is a wasteful number, since it uses less digits than its factorization.

1285139955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409971.

The product of its digits is 486000, while the sum is 48.

The square root of 1285139955 is about 35848.8487262841. The cubic root of 1285139955 is about 1087.2184373465.

The spelling of 1285139955 in words is "one billion, two hundred eighty-five million, one hundred thirty-nine thousand, nine hundred fifty-five".