1977533989 has 8 divisors (see below), whose sum is σ = 2051006720. Its totient is φ = 1904666400.

The previous prime is 1977533969. The next prime is 1977534019. The reversal of 1977533989 is 9893357791.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1977533989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1977533939) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144624 + ... + 157705.

It is an arithmetic number, because the mean of its divisors is an integer number (256375840).

Almost surely, 2^1977533989 is an apocalyptic number.

It is an amenable number.

1977533989 is a deficient number, since it is larger than the sum of its proper divisors (73472731).

1977533989 is a wasteful number, since it uses less digits than its factorization.

1977533989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302571.

The product of its digits is 12859560, while the sum is 61.

The square root of 1977533989 is about 44469.4725514032. The cubic root of 1977533989 is about 1255.1857079831.

The spelling of 1977533989 in words is "one billion, nine hundred seventy-seven million, five hundred thirty-three thousand, nine hundred eighty-nine".