53891989 has 8 divisors (see below), whose sum is σ = 57127680. Its totient is φ = 50663616.

The previous prime is 53891963. The next prime is 53891993. The reversal of 53891989 is 98919835.

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

It is a cyclic number.

It is not a de Polignac number, because 53891989 - 2⁷ = 53891861 is a prime.

It is a super-2 number, since 2×53891989² = 5808692956752242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53891909) 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, 23362 + ... + 25564.

It is an arithmetic number, because the mean of its divisors is an integer number (7140960).

Almost surely, 2^53891989 is an apocalyptic number.

It is an amenable number.

53891989 is a deficient number, since it is larger than the sum of its proper divisors (3235691).

53891989 is a wasteful number, since it uses less digits than its factorization.

53891989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3659.

The product of its digits is 699840, while the sum is 52.

The square root of 53891989 is about 7341.1163320029. The cubic root of 53891989 is about 377.7241368828.

The spelling of 53891989 in words is "fifty-three million, eight hundred ninety-one thousand, nine hundred eighty-nine".