1623240 has 96 divisors (see below), whose sum is σ = 5503680. Its totient is φ = 430272.

The previous prime is 1623233. The next prime is 1623263. The reversal of 1623240 is 423261.

1623240 = 3² + 4² + ... + 169².

It is a happy number.

1623240 is a `hidden beast` number, since 1 + 623 + 2 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nialpdrome in base 6.

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, 9637 + ... + 9803.

It is an arithmetic number, because the mean of its divisors is an integer number (57330).

2^1623240 is an apocalyptic number.

1623240 is a gapful number since it is divisible by the number (10) 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 1623240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2751840).

1623240 is an abundant number, since it is smaller than the sum of its proper divisors (3880440).

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

1623240 is a wasteful number, since it uses less digits than its factorization.

1623240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193 (or 177 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 1623240 is about 1274.0643625814. The cubic root of 1623240 is about 117.5242744476.

The spelling of 1623240 in words is "one million, six hundred twenty-three thousand, two hundred forty".