1200143385 has 80 divisors (see below), whose sum is σ = 2473929216. Its totient is φ = 545242752.

The previous prime is 1200143383. The next prime is 1200143389. The reversal of 1200143385 is 5833410021.

It is a happy number.

It is not a de Polignac number, because 1200143385 - 2¹ = 1200143383 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1200143383) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 489232 + ... + 491678.

Almost surely, 2^1200143385 is an apocalyptic number.

1200143385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1200143385 is an abundant number, since it is smaller than the sum of its proper divisors (1273785831).

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

1200143385 is a wasteful number, since it uses less digits than its factorization.

1200143385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2644 (or 2635 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 1200143385 is about 34643.0856737676. The cubic root of 1200143385 is about 1062.7008923022.

The spelling of 1200143385 in words is "one billion, two hundred million, one hundred forty-three thousand, three hundred eighty-five".