1921946464 has 24 divisors (see below), whose sum is σ = 3914310960. Its totient is φ = 927835776.

The previous prime is 1921946443. The next prime is 1921946479. The reversal of 1921946464 is 4646491291.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1034604 + ... + 1036459.

It is an arithmetic number, because the mean of its divisors is an integer number (163096290).

Almost surely, 2^1921946464 is an apocalyptic number.

It is an amenable number.

1921946464 is an abundant number, since it is smaller than the sum of its proper divisors (1992364496).

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

1921946464 is a wasteful number, since it uses less digits than its factorization.

1921946464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2071102 (or 2071094 counting only the distinct ones).

The product of its digits is 373248, while the sum is 46.

The square root of 1921946464 is about 43840.0098540135. The cubic root of 1921946464 is about 1243.3128685993.

The spelling of 1921946464 in words is "one billion, nine hundred twenty-one million, nine hundred forty-six thousand, four hundred sixty-four".