1201290636 has 96 divisors (see below), whose sum is σ = 3456624640. Its totient is φ = 316203264.

The previous prime is 1201290589. The next prime is 1201290653. The reversal of 1201290636 is 6360921021.

1201290636 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 904605 + ... + 905931.

Almost surely, 2^1201290636 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1201290636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1728312320).

1201290636 is an abundant number, since it is smaller than the sum of its proper divisors (2255334004).

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

1201290636 is a wasteful number, since it uses less digits than its factorization.

1201290636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2183 (or 2181 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 1201290636 is about 34659.6398711816. The cubic root of 1201290636 is about 1063.0394064049.

The spelling of 1201290636 in words is "one billion, two hundred one million, two hundred ninety thousand, six hundred thirty-six".