1285800397 has 16 divisors (see below), whose sum is σ = 1498528512. Its totient is φ = 1080547200.

The previous prime is 1285800377. The next prime is 1285800401. The reversal of 1285800397 is 7930085821.

It is a cyclic number.

It is not a de Polignac number, because 1285800397 - 2¹⁵ = 1285767629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285800317) 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, 63993 + ... + 81649.

It is an arithmetic number, because the mean of its divisors is an integer number (93658032).

Almost surely, 2^1285800397 is an apocalyptic number.

It is an amenable number.

1285800397 is a deficient number, since it is larger than the sum of its proper divisors (212728115).

1285800397 is a wasteful number, since it uses less digits than its factorization.

1285800397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17868.

The product of its (nonzero) digits is 120960, while the sum is 43.

The square root of 1285800397 is about 35858.0590244369. The cubic root of 1285800397 is about 1087.4046483889.

The spelling of 1285800397 in words is "one billion, two hundred eighty-five million, eight hundred thousand, three hundred ninety-seven".