1642720 has 24 divisors (see below), whose sum is σ = 3881304. Its totient is φ = 657024.

The previous prime is 1642717. The next prime is 1642723. The reversal of 1642720 is 272461.

It is an interprime number because it is at equal distance from previous prime (1642717) and next prime (1642723).

It is a nialpdrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 1642691 and 1642700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1642723) 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, 4974 + ... + 5293.

It is an arithmetic number, because the mean of its divisors is an integer number (161721).

2^1642720 is an apocalyptic number.

1642720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1642720 is an abundant number, since it is smaller than the sum of its proper divisors (2238584).

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

1642720 is a wasteful number, since it uses less digits than its factorization.

1642720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10282 (or 10274 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 1642720 is about 1281.6863890984. The cubic root of 1642720 is about 117.9925304091.

The spelling of 1642720 in words is "one million, six hundred forty-two thousand, seven hundred twenty".