53402515 has 4 divisors (see below), whose sum is σ = 64083024. Its totient is φ = 42722008.

The previous prime is 53402501. The next prime is 53402519. The reversal of 53402515 is 51520435.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 53402515 - 2⁹ = 53402003 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 53402515.

It is not an unprimeable number, because it can be changed into a prime (53402519) 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, 5340247 + ... + 5340256.

It is an arithmetic number, because the mean of its divisors is an integer number (16020756).

Almost surely, 2^53402515 is an apocalyptic number.

53402515 is a deficient number, since it is larger than the sum of its proper divisors (10680509).

53402515 is a wasteful number, since it uses less digits than its factorization.

53402515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10680508.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 53402515 is about 7307.7024433128. The cubic root of 53402515 is about 376.5770973319.

The spelling of 53402515 in words is "fifty-three million, four hundred two thousand, five hundred fifteen".