1912640 has 56 divisors (see below), whose sum is σ = 4693920. Its totient is φ = 741888.

The previous prime is 1912639. The next prime is 1912643. The reversal of 1912640 is 462191.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1912643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13691 + ... + 13829.

It is an arithmetic number, because the mean of its divisors is an integer number (83820).

2^1912640 is an apocalyptic number.

1912640 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 1912640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2346960).

1912640 is an abundant number, since it is smaller than the sum of its proper divisors (2781280).

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

1912640 is a wasteful number, since it uses less digits than its factorization.

1912640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199 (or 189 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 1912640 is about 1382.9822847745. The cubic root of 1912640 is about 124.1302827699.

It can be divided in two parts, 1912 and 640, that added together give a palindrome (2552).

The spelling of 1912640 in words is "one million, nine hundred twelve thousand, six hundred forty".