1201836400 has 30 divisors (see below), whose sum is σ = 2887412912. Its totient is φ = 480734400.

The previous prime is 1201836397. The next prime is 1201836409. The reversal of 1201836400 is 46381021.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201836409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1501896 + ... + 1502695.

Almost surely, 2^1201836400 is an apocalyptic number.

1201836400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1201836400 is an abundant number, since it is smaller than the sum of its proper divisors (1685576512).

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

1201836400 is a wasteful number, since it uses less digits than its factorization.

1201836400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3004609 (or 3004598 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 1201836400 is about 34667.5121691765. The cubic root of 1201836400 is about 1063.2003668430.

The spelling of 1201836400 in words is "one billion, two hundred one million, eight hundred thirty-six thousand, four hundred".