53987409 has 12 divisors (see below), whose sum is σ = 89122176. Its totient is φ = 30849912.

The previous prime is 53987407. The next prime is 53987411. The reversal of 53987409 is 90478935.

53987409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (53987407) and next prime (53987411).

It is not a de Polignac number, because 53987409 - 2¹ = 53987407 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53987407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 428409 + ... + 428534.

It is an arithmetic number, because the mean of its divisors is an integer number (7426848).

Almost surely, 2^53987409 is an apocalyptic number.

It is an amenable number.

53987409 is a deficient number, since it is larger than the sum of its proper divisors (35134767).

53987409 is a wasteful number, since it uses less digits than its factorization.

53987409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 856956 (or 856953 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The square root of 53987409 is about 7347.6124693672. The cubic root of 53987409 is about 377.9469355258.

The spelling of 53987409 in words is "fifty-three million, nine hundred eighty-seven thousand, four hundred nine".