53402709 has 4 divisors (see below), whose sum is σ = 71203616. Its totient is φ = 35601804.

The previous prime is 53402693. The next prime is 53402731. The reversal of 53402709 is 90720435.

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 not a de Polignac number, because 53402709 - 2⁴ = 53402693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53402009) 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, 8900449 + ... + 8900454.

It is an arithmetic number, because the mean of its divisors is an integer number (17800904).

Almost surely, 2^53402709 is an apocalyptic number.

It is an amenable number.

53402709 is a deficient number, since it is larger than the sum of its proper divisors (17800907).

53402709 is a wasteful number, since it uses less digits than its factorization.

53402709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17800906.

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 53402709 is about 7307.7157169666. The cubic root of 53402709 is about 376.5775533396.

The spelling of 53402709 in words is "fifty-three million, four hundred two thousand, seven hundred nine".