1973398640 has 40 divisors (see below), whose sum is σ = 4590576720. Its totient is φ = 788942336.

The previous prime is 1973398639. The next prime is 1973398673. The reversal of 1973398640 is 468933791.

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

It is a congruent number.

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, 178391 + ... + 189129.

It is an arithmetic number, because the mean of its divisors is an integer number (114764418).

Almost surely, 2^1973398640 is an apocalyptic number.

1973398640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1973398640 is an abundant number, since it is smaller than the sum of its proper divisors (2617178080).

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

1973398640 is a wasteful number, since it uses less digits than its factorization.

1973398640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13049 (or 13043 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 50.

The square root of 1973398640 is about 44422.9517254313. The cubic root of 1973398640 is about 1254.3101641062.

The spelling of 1973398640 in words is "one billion, nine hundred seventy-three million, three hundred ninety-eight thousand, six hundred forty".