1562640 has 80 divisors (see below), whose sum is σ = 5142528. Its totient is φ = 391168.

The previous prime is 1562611. The next prime is 1562647. The reversal of 1562640 is 462651.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1562640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1562647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3889 + ... + 4271.

2^1562640 is an apocalyptic number.

1562640 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 1562640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2571264).

1562640 is an abundant number, since it is smaller than the sum of its proper divisors (3579888).

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

1562640 is a wasteful number, since it uses less digits than its factorization.

1562640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416 (or 410 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 1562640 is about 1250.0559987457. The cubic root of 1562640 is about 116.0431864565.

The spelling of 1562640 in words is "one million, five hundred sixty-two thousand, six hundred forty".