1961814426 has 128 divisors (see below), whose sum is σ = 4730019840. Its totient is φ = 534643200.

The previous prime is 1961814401. The next prime is 1961814431. The reversal of 1961814426 is 6244181691.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6981406 + ... + 6981686.

It is an arithmetic number, because the mean of its divisors is an integer number (36953280).

Almost surely, 2^1961814426 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1961814426, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2365009920).

1961814426 is an abundant number, since it is smaller than the sum of its proper divisors (2768205414).

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

1961814426 is a wasteful number, since it uses less digits than its factorization.

1961814426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492.

The product of its digits is 82944, while the sum is 42.

The square root of 1961814426 is about 44292.3743549609. The cubic root of 1961814426 is about 1251.8510018940.

The spelling of 1961814426 in words is "one billion, nine hundred sixty-one million, eight hundred fourteen thousand, four hundred twenty-six".