1397821200 has 120 divisors (see below), whose sum is σ = 4587060576. Its totient is φ = 363648000.

The previous prime is 1397821169. The next prime is 1397821211. The reversal of 1397821200 is 21287931.

It is a tau number, because it is divible by the number of its divisors (120).

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, 34995 + ... + 63405.

Almost surely, 2^1397821200 is an apocalyptic number.

1397821200 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 1397821200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2293530288).

1397821200 is an abundant number, since it is smaller than the sum of its proper divisors (3189239376).

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

1397821200 is a wasteful number, since it uses less digits than its factorization.

1397821200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28473 (or 28462 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 1397821200 is about 37387.4470912364. The cubic root of 1397821200 is about 1118.1083075596.

The spelling of 1397821200 in words is "one billion, three hundred ninety-seven million, eight hundred twenty-one thousand, two hundred".