2197961400 has 96 divisors (see below), whose sum is σ = 6836169600. Its totient is φ = 584188800.

The previous prime is 2197961387. The next prime is 2197961407. The reversal of 2197961400 is 41697912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2197961407) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 180711 + ... + 192489.

It is an arithmetic number, because the mean of its divisors is an integer number (71210100).

Almost surely, 2^2197961400 is an apocalyptic number.

2197961400 is a gapful number since it is divisible by the number (20) 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 2197961400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3418084800).

2197961400 is an abundant number, since it is smaller than the sum of its proper divisors (4638208200).

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

2197961400 is a wasteful number, since it uses less digits than its factorization.

2197961400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12109 (or 12100 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 2197961400 is about 46882.4210125714. The cubic root of 2197961400 is about 1300.1895975935.

The spelling of 2197961400 in words is "two billion, one hundred ninety-seven million, nine hundred sixty-one thousand, four hundred".