2145550 has 48 divisors (see below), whose sum is σ = 4499712. Its totient is φ = 754400.

The previous prime is 2145547. The next prime is 2145551. The reversal of 2145550 is 555412.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145551) 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, 25809 + ... + 25891.

It is an arithmetic number, because the mean of its divisors is an integer number (93744).

2^2145550 is an apocalyptic number.

2145550 is an abundant number, since it is smaller than the sum of its proper divisors (2354162).

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

2145550 is a wasteful number, since it uses less digits than its factorization.

2145550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153 (or 148 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 2145550 is about 1464.7696064569. The cubic root of 2145550 is about 128.9771808284.

The spelling of 2145550 in words is "two million, one hundred forty-five thousand, five hundred fifty".