1642240 has 36 divisors (see below), whose sum is σ = 3936744. Its totient is φ = 656384.

The previous prime is 1642231. The next prime is 1642243. The reversal of 1642240 is 422461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1642243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 639 + ... + 1921.

It is an arithmetic number, because the mean of its divisors is an integer number (109354).

2^1642240 is an apocalyptic number.

1642240 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 1642240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1968372).

1642240 is an abundant number, since it is smaller than the sum of its proper divisors (2294504).

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

1642240 is an equidigital number, since it uses as much as digits as its factorization.

1642240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1304 (or 1290 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 1642240 is about 1281.4991221222. The cubic root of 1642240 is about 117.9810368838.

The spelling of 1642240 in words is "one million, six hundred forty-two thousand, two hundred forty".