1993770640 has 40 divisors (see below), whose sum is σ = 4837065408. Its totient is φ = 762833280.

The previous prime is 1993770607. The next prime is 1993770661. The reversal of 1993770640 is 460773991.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (46).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 539946 + ... + 543625.

Almost surely, 2^1993770640 is an apocalyptic number.

1993770640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1993770640 is an abundant number, since it is smaller than the sum of its proper divisors (2843294768).

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

1993770640 is a wasteful number, since it uses less digits than its factorization.

1993770640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1083607 (or 1083601 counting only the distinct ones).

The product of its (nonzero) digits is 285768, while the sum is 46.

The square root of 1993770640 is about 44651.6588717597. The cubic root of 1993770640 is about 1258.6116058208.

The spelling of 1993770640 in words is "one billion, nine hundred ninety-three million, seven hundred seventy thousand, six hundred forty".