2197440 has 168 divisors, whose sum is σ = 8717280. Its totient is φ = 497664.

The previous prime is 2197427. The next prime is 2197453. The reversal of 2197440 is 447912.

It is a happy number.

2197440 is a `hidden beast` number, since 219 + 7 + 440 = 666.

It is an interprime number because it is at equal distance from previous prime (2197427) and next prime (2197453).

It is a tau number, because it is divible by the number of its divisors (168).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

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, 20106 + ... + 20214.

2^2197440 is an apocalyptic number.

2197440 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 2197440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4358640).

2197440 is an abundant number, since it is smaller than the sum of its proper divisors (6519840).

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

2197440 is a wasteful number, since it uses less digits than its factorization.

2197440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139 (or 126 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 2197440 is about 1482.3764704015. The cubic root of 2197440 is about 130.0086779217.

It can be divided in two parts, 21 and 97440, that added together give a triangular number (97461 = T₄₄₁).

The spelling of 2197440 in words is "two million, one hundred ninety-seven thousand, four hundred forty".