1921144964 has 24 divisors (see below), whose sum is σ = 3384763200. Its totient is φ = 954092000.

The previous prime is 1921144957. The next prime is 1921144987. The reversal of 1921144964 is 4694411291.

It is a super-2 number, since 2×1921144964² = 7381595945405122592, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 388097 + ... + 393015.

It is an arithmetic number, because the mean of its divisors is an integer number (141031800).

Almost surely, 2^1921144964 is an apocalyptic number.

It is an amenable number.

1921144964 is a deficient number, since it is larger than the sum of its proper divisors (1463618236).

1921144964 is a wasteful number, since it uses less digits than its factorization.

1921144964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5563 (or 5561 counting only the distinct ones).

The product of its digits is 62208, while the sum is 41.

The square root of 1921144964 is about 43830.8677075871. The cubic root of 1921144964 is about 1243.1400136597.

The spelling of 1921144964 in words is "one billion, nine hundred twenty-one million, one hundred forty-four thousand, nine hundred sixty-four".