1989376453 has 4 divisors (see below), whose sum is σ = 2013344928. Its totient is φ = 1965407980.

The previous prime is 1989376451. The next prime is 1989376463. The reversal of 1989376453 is 3546739891.

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 cyclic number.

It is not a de Polignac number, because 1989376453 - 2¹ = 1989376451 is a prime.

It is a super-2 number, since 2×1989376453² = 7915237343501722418, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1989376394 and 1989376403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989376451) 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, 11984113 + ... + 11984278.

It is an arithmetic number, because the mean of its divisors is an integer number (503336232).

Almost surely, 2^1989376453 is an apocalyptic number.

It is an amenable number.

1989376453 is a deficient number, since it is larger than the sum of its proper divisors (23968475).

1989376453 is an equidigital number, since it uses as much as digits as its factorization.

1989376453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23968474.

The product of its digits is 4898880, while the sum is 55.

The square root of 1989376453 is about 44602.4265371291. The cubic root of 1989376453 is about 1257.6862832721.

The spelling of 1989376453 in words is "one billion, nine hundred eighty-nine million, three hundred seventy-six thousand, four hundred fifty-three".