53138403 has 16 divisors (see below), whose sum is σ = 78873600. Its totient is φ = 35358120.

The previous prime is 53138399. The next prime is 53138431. The reversal of 53138403 is 30483135.

It is a happy number.

It is not a de Polignac number, because 53138403 - 2² = 53138399 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (53138483) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15478 + ... + 18596.

It is an arithmetic number, because the mean of its divisors is an integer number (4929600).

Almost surely, 2^53138403 is an apocalyptic number.

53138403 is a deficient number, since it is larger than the sum of its proper divisors (25735197).

53138403 is a wasteful number, since it uses less digits than its factorization.

53138403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3759 (or 3753 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 53138403 is about 7289.6092487869. The cubic root of 53138403 is about 375.9552605399.

The spelling of 53138403 in words is "fifty-three million, one hundred thirty-eight thousand, four hundred three".