1961859380 has 48 divisors (see below), whose sum is σ = 4490325504. Its totient is φ = 715643520.

The previous prime is 1961859371. The next prime is 1961859401. The reversal of 1961859380 is 839581691.

It is a happy number.

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, 23876 + ... + 67035.

It is an arithmetic number, because the mean of its divisors is an integer number (93548448).

Almost surely, 2^1961859380 is an apocalyptic number.

1961859380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1961859380 is an abundant number, since it is smaller than the sum of its proper divisors (2528466124).

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

1961859380 is a wasteful number, since it uses less digits than its factorization.

1961859380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91016 (or 91014 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 50.

The square root of 1961859380 is about 44292.8818208976. The cubic root of 1961859380 is about 1251.8605636683.

The spelling of 1961859380 in words is "one billion, nine hundred sixty-one million, eight hundred fifty-nine thousand, three hundred eighty".