1961440 has 96 divisors (see below), whose sum is σ = 5334336. Its totient is φ = 675840.

The previous prime is 1961431. The next prime is 1961441. The reversal of 1961440 is 441691.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1961441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47820 + ... + 47860.

It is an arithmetic number, because the mean of its divisors is an integer number (55566).

2^1961440 is an apocalyptic number.

1961440 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 1961440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2667168).

1961440 is an abundant number, since it is smaller than the sum of its proper divisors (3372896).

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

1961440 is a wasteful number, since it uses less digits than its factorization.

1961440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92 (or 84 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 1961440 is about 1400.5141912883. The cubic root of 1961440 is about 125.1771355321.

It can be divided in two parts, 1961 and 440, that added together give a 4-th power (2401 = 7⁴).

The spelling of 1961440 in words is "one million, nine hundred sixty-one thousand, four hundred forty".