1285161390 has 112 divisors (see below), whose sum is σ = 3588537600. Its totient is φ = 330837696.

The previous prime is 1285161377. The next prime is 1285161391. The reversal of 1285161390 is 931615821.

1285161390 is a `hidden beast` number, since 1 + 2 + 8 + 516 + 139 + 0 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285161391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 208371 + ... + 214449.

Almost surely, 2^1285161390 is an apocalyptic number.

1285161390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1285161390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1794268800).

1285161390 is an abundant number, since it is smaller than the sum of its proper divisors (2303376210).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1285161390 is an equidigital number, since it uses as much as digits as its factorization.

1285161390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6133 (or 6118 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 1285161390 is about 35849.1476886132. The cubic root of 1285161390 is about 1087.2244819275.

The spelling of 1285161390 in words is "one billion, two hundred eighty-five million, one hundred sixty-one thousand, three hundred ninety".