1201553400 has 96 divisors (see below), whose sum is σ = 3766834800. Its totient is φ = 316800000.

The previous prime is 1201553399. The next prime is 1201553413. The reversal of 1201553400 is 43551021.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42150 + ... + 64650.

Almost surely, 2^1201553400 is an apocalyptic number.

1201553400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1201553400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1883417400).

1201553400 is an abundant number, since it is smaller than the sum of its proper divisors (2565281400).

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

1201553400 is a wasteful number, since it uses less digits than its factorization.

1201553400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22609 (or 22600 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 1201553400 is about 34663.4302976494. The cubic root of 1201553400 is about 1063.1169086386.

The spelling of 1201553400 in words is "one billion, two hundred one million, five hundred fifty-three thousand, four hundred".