53447389 has 2 divisors, whose sum is σ = 53447390. Its totient is φ = 53447388.

The previous prime is 53447363. The next prime is 53447393. The reversal of 53447389 is 98374435.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27772900 + 25674489 = 5270^2 + 5067^2 .

It is a cyclic number.

It is not a de Polignac number, because 53447389 - 2¹⁷ = 53316317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53447089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26723694 + 26723695.

It is an arithmetic number, because the mean of its divisors is an integer number (26723695).

Almost surely, 2^53447389 is an apocalyptic number.

It is an amenable number.

53447389 is a deficient number, since it is larger than the sum of its proper divisors (1).

53447389 is an equidigital number, since it uses as much as digits as its factorization.

53447389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 43.

The square root of 53447389 is about 7310.7721206450. The cubic root of 53447389 is about 376.6825467326.

The spelling of 53447389 in words is "fifty-three million, four hundred forty-seven thousand, three hundred eighty-nine".