1285942770 has 288 divisors, whose sum is σ = 4157516160. Its totient is φ = 281957760.

The previous prime is 1285942759. The next prime is 1285942771. The reversal of 1285942770 is 772495821.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285942771) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 18111835 + ... + 18111905.

It is an arithmetic number, because the mean of its divisors is an integer number (14435820).

Almost surely, 2^1285942770 is an apocalyptic number.

1285942770 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 1285942770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2078758080).

1285942770 is an abundant number, since it is smaller than the sum of its proper divisors (2871573390).

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

1285942770 is a wasteful number, since it uses less digits than its factorization.

1285942770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175 (or 125 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 45.

The square root of 1285942770 is about 35860.0441996381. The cubic root of 1285942770 is about 1087.4447819764. Note that the first 3 decimals are identical.

The spelling of 1285942770 in words is "one billion, two hundred eighty-five million, nine hundred forty-two thousand, seven hundred seventy".