1201402636 has 12 divisors (see below), whose sum is σ = 2402805328. Its totient is φ = 514886832.

The previous prime is 1201402621. The next prime is 1201402639. The reversal of 1201402636 is 6362041021.

1201402636 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 1201402636.

It is not an unprimeable number, because it can be changed into a prime (1201402639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21453591 + ... + 21453646.

Almost surely, 2^1201402636 is an apocalyptic number.

It is an amenable number.

1201402636 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1201402636 is a wasteful number, since it uses less digits than its factorization.

1201402636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42907248 (or 42907246 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 1201402636 is about 34661.2555456377. The cubic root of 1201402636 is about 1063.0724421833.

Adding to 1201402636 its reverse (6362041021), we get a palindrome (7563443657).

The spelling of 1201402636 in words is "one billion, two hundred one million, four hundred two thousand, six hundred thirty-six".