1961225784 has 168 divisors, whose sum is σ = 6414510960. Its totient is φ = 560268576.

The previous prime is 1961225779. The next prime is 1961225843. The reversal of 1961225784 is 4875221691.

1961225784 is a `hidden beast` number, since 1 + 9 + 612 + 25 + 7 + 8 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (168).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 41 ways as a sum of consecutive naturals, for example, 282337 + ... + 289199.

Almost surely, 2^1961225784 is an apocalyptic number.

1961225784 is a gapful number since it is divisible by the number (14) 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 1961225784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3207255480).

1961225784 is an abundant number, since it is smaller than the sum of its proper divisors (4453285176).

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

1961225784 is an equidigital number, since it uses as much as digits as its factorization.

1961225784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6901 (or 6875 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 1961225784 is about 44285.7288976934. The cubic root of 1961225784 is about 1251.7257834939.

The spelling of 1961225784 in words is "one billion, nine hundred sixty-one million, two hundred twenty-five thousand, seven hundred eighty-four".