1961843740 has 24 divisors (see below), whose sum is σ = 4146119712. Its totient is φ = 779737920.

The previous prime is 1961843731. The next prime is 1961843747. The reversal of 1961843740 is 473481691.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1961843747) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 309256 + ... + 315535.

It is an arithmetic number, because the mean of its divisors is an integer number (172754988).

Almost surely, 2^1961843740 is an apocalyptic number.

1961843740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1961843740 is an abundant number, since it is smaller than the sum of its proper divisors (2184275972).

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

1961843740 is a wasteful number, since it uses less digits than its factorization.

1961843740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624957 (or 624955 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 1961843740 is about 44292.7052684751. The cubic root of 1961843740 is about 1251.8572370365.

The spelling of 1961843740 in words is "one billion, nine hundred sixty-one million, eight hundred forty-three thousand, seven hundred forty".