2157408 has 96 divisors (see below), whose sum is σ = 6894720. Its totient is φ = 650880.

The previous prime is 2157401. The next prime is 2157413. The reversal of 2157408 is 8047512.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9391 + ... + 9617.

It is an arithmetic number, because the mean of its divisors is an integer number (71820).

2^2157408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2157408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3447360).

2157408 is an abundant number, since it is smaller than the sum of its proper divisors (4737312).

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

2157408 is a wasteful number, since it uses less digits than its factorization.

2157408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257 (or 243 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 2157408 is about 1468.8117646588. The cubic root of 2157408 is about 129.2143542730.

The spelling of 2157408 in words is "two million, one hundred fifty-seven thousand, four hundred eight".