1461640 has 16 divisors (see below), whose sum is σ = 3288780. Its totient is φ = 584640.

The previous prime is 1461637. The next prime is 1461641. The reversal of 1461640 is 461641.

It can be written as a sum of positive squares in 2 ways, for example, as 1397124 + 64516 = 1182^2 + 254^2 .

It is not an unprimeable number, because it can be changed into a prime (1461641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18231 + ... + 18310.

2^1461640 is an apocalyptic number.

1461640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1461640 is an abundant number, since it is smaller than the sum of its proper divisors (1827140).

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

1461640 is a wasteful number, since it uses less digits than its factorization.

1461640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36552 (or 36548 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 1461640 is about 1208.9830437190. The cubic root of 1461640 is about 113.4871805273.

Subtracting from 1461640 its reverse (461641), we obtain a palindrome (999999).

The spelling of 1461640 in words is "one million, four hundred sixty-one thousand, six hundred forty".