1285158 has 32 divisors (see below), whose sum is σ = 3020544. Its totient is φ = 356832.

The previous prime is 1285147. The next prime is 1285159. The reversal of 1285158 is 8515821.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285159) 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, 1141 + ... + 1967.

It is an arithmetic number, because the mean of its divisors is an integer number (94392).

2^1285158 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1285158, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1510272).

1285158 is an abundant number, since it is smaller than the sum of its proper divisors (1735386).

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

1285158 is a wasteful number, since it uses less digits than its factorization.

1285158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 876.

The product of its digits is 3200, while the sum is 30.

The square root of 1285158 is about 1133.6480935458. The cubic root of 1285158 is about 108.7223525966.

The spelling of 1285158 in words is "one million, two hundred eighty-five thousand, one hundred fifty-eight".