1989740377 has 4 divisors (see below), whose sum is σ = 1994357376. Its totient is φ = 1985123380.

The previous prime is 1989740353. The next prime is 1989740387. The reversal of 1989740377 is 7730479891.

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, and also an emirpimes, since its reverse is a distinct semiprime: 7730479891 = 163 ⋅47426257.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1989740377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1989740387) 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, 2307853 + ... + 2308714.

It is an arithmetic number, because the mean of its divisors is an integer number (498589344).

Almost surely, 2^1989740377 is an apocalyptic number.

It is an amenable number.

1989740377 is a deficient number, since it is larger than the sum of its proper divisors (4616999).

1989740377 is an equidigital number, since it uses as much as digits as its factorization.

1989740377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4616998.

The product of its (nonzero) digits is 2667168, while the sum is 55.

The square root of 1989740377 is about 44606.5059940812. The cubic root of 1989740377 is about 1257.7629696655.

The spelling of 1989740377 in words is "one billion, nine hundred eighty-nine million, seven hundred forty thousand, three hundred seventy-seven".