1961378830 has 32 divisors (see below), whose sum is σ = 3551719104. Its totient is φ = 779847936.

The previous prime is 1961378803. The next prime is 1961378833. The reversal of 1961378830 is 388731691.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1961378833) 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, 2057634 + ... + 2058586.

It is an arithmetic number, because the mean of its divisors is an integer number (110991222).

Almost surely, 2^1961378830 is an apocalyptic number.

1961378830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1961378830 is a deficient number, since it is larger than the sum of its proper divisors (1590340274).

1961378830 is a wasteful number, since it uses less digits than its factorization.

1961378830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1980.

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 1961378830 is about 44287.4568021240. The cubic root of 1961378830 is about 1251.7583424922.

The spelling of 1961378830 in words is "one billion, nine hundred sixty-one million, three hundred seventy-eight thousand, eight hundred thirty".