1997959393 has 4 divisors (see below), whose sum is σ = 2062409728. Its totient is φ = 1933509060.

The previous prime is 1997959373. The next prime is 1997959399. The reversal of 1997959393 is 3939597991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-1997959393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1997959399) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32225121 + ... + 32225182.

It is an arithmetic number, because the mean of its divisors is an integer number (515602432).

Almost surely, 2^1997959393 is an apocalyptic number.

It is an amenable number.

1997959393 is a deficient number, since it is larger than the sum of its proper divisors (64450335).

1997959393 is an equidigital number, since it uses as much as digits as its factorization.

1997959393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64450334.

The product of its digits is 18600435, while the sum is 64.

The square root of 1997959393 is about 44698.5390477139. The cubic root of 1997959393 is about 1259.4924034597.

The spelling of 1997959393 in words is "one billion, nine hundred ninety-seven million, nine hundred fifty-nine thousand, three hundred ninety-three".