53400389 has 4 divisors (see below), whose sum is σ = 61029024. Its totient is φ = 45771756.

The previous prime is 53400377. The next prime is 53400433. The reversal of 53400389 is 98300435.

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 a de Polignac number, because none of the positive numbers 2^k-53400389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53400329) 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, 3814307 + ... + 3814320.

It is an arithmetic number, because the mean of its divisors is an integer number (15257256).

Almost surely, 2^53400389 is an apocalyptic number.

It is an amenable number.

53400389 is a deficient number, since it is larger than the sum of its proper divisors (7628635).

53400389 is an equidigital number, since it uses as much as digits as its factorization.

53400389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7628634.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 53400389 is about 7307.5569789089. The cubic root of 53400389 is about 376.5720999797.

The spelling of 53400389 in words is "fifty-three million, four hundred thousand, three hundred eighty-nine".