913640 has 64 divisors (see below), whose sum is σ = 2540160. Its totient is φ = 288000.

The previous prime is 913639. The next prime is 913687. The reversal of 913640 is 46319.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 913640.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3515 + ... + 3765.

It is an arithmetic number, because the mean of its divisors is an integer number (39690).

2⁹¹³⁶⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 913640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1270080).

913640 is an abundant number, since it is smaller than the sum of its proper divisors (1626520).

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

913640 is a wasteful number, since it uses less digits than its factorization.

913640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282 (or 278 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 913640 is about 955.8451757476. The cubic root of 913640 is about 97.0342458880.

Adding to 913640 its reverse (46319), we get a palindrome (959959).

It can be divided in two parts, 9 and 13640, that multiplied together give a triangular number (122760 = T₄₉₅).

The spelling of 913640 in words is "nine hundred thirteen thousand, six hundred forty".