1201988835 has 64 divisors (see below), whose sum is σ = 2184860160. Its totient is φ = 626797440.

The previous prime is 1201988803. The next prime is 1201988861. The reversal of 1201988835 is 5388891021.

It is a happy number.

1201988835 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1201988835 - 2⁵ = 1201988803 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

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

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1869024 + ... + 1869666.

It is an arithmetic number, because the mean of its divisors is an integer number (34138440).

Almost surely, 2^1201988835 is an apocalyptic number.

1201988835 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1201988835 is a deficient number, since it is larger than the sum of its proper divisors (982871325).

1201988835 is a wasteful number, since it uses less digits than its factorization.

1201988835 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 945 (or 939 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

The square root of 1201988835 is about 34669.7106275781. The cubic root of 1201988835 is about 1063.2453153058.

The spelling of 1201988835 in words is "one billion, two hundred one million, nine hundred eighty-eight thousand, eight hundred thirty-five".