2157504 has 56 divisors (see below), whose sum is σ = 6053328. Its totient is φ = 675840.

The previous prime is 2157503. The next prime is 2157511. The reversal of 2157504 is 4057512.

2157504 = T₂₂₇ + T₂₂₈ + ... + T₂₉₀.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2934 + ... + 3594.

2^2157504 is an apocalyptic number.

2157504 is a gapful number since it is divisible by the number (24) 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 2157504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3026664).

2157504 is an abundant number, since it is smaller than the sum of its proper divisors (3895824).

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

2157504 is a wasteful number, since it uses less digits than its factorization.

2157504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693 (or 683 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 24.

The square root of 2157504 is about 1468.8444437720. The cubic root of 2157504 is about 129.2162708312.

The spelling of 2157504 in words is "two million, one hundred fifty-seven thousand, five hundred four".