1285428940 has 24 divisors (see below), whose sum is σ = 2713111632. Its totient is φ = 511560000.

The previous prime is 1285428913. The next prime is 1285428953. The reversal of 1285428940 is 498245821.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

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, 159186 + ... + 167065.

It is an arithmetic number, because the mean of its divisors is an integer number (113046318).

Almost surely, 2^1285428940 is an apocalyptic number.

1285428940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1285428940 is an abundant number, since it is smaller than the sum of its proper divisors (1427682692).

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

1285428940 is a wasteful number, since it uses less digits than its factorization.

1285428940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326457 (or 326455 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 43.

The square root of 1285428940 is about 35852.8791033579. The cubic root of 1285428940 is about 1087.2999242621.

The spelling of 1285428940 in words is "one billion, two hundred eighty-five million, four hundred twenty-eight thousand, nine hundred forty".