1961389830 has 32 divisors (see below), whose sum is σ = 4708502784. Its totient is φ = 522907616.

The previous prime is 1961389823. The next prime is 1961389877. The reversal of 1961389830 is 389831691.

1961389830 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 1961389830.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 222079 + ... + 230741.

It is an arithmetic number, because the mean of its divisors is an integer number (147140712).

Almost surely, 2^1961389830 is an apocalyptic number.

1961389830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1961389830 is an abundant number, since it is smaller than the sum of its proper divisors (2747112954).

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

1961389830 is a wasteful number, since it uses less digits than its factorization.

1961389830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16220.

The product of its (nonzero) digits is 279936, while the sum is 48.

The square root of 1961389830 is about 44287.5809906118. The cubic root of 1961389830 is about 1251.7606825665.

The spelling of 1961389830 in words is "one billion, nine hundred sixty-one million, three hundred eighty-nine thousand, eight hundred thirty".