53993969 has 4 divisors (see below), whose sum is σ = 55855860. Its totient is φ = 52132080.

The previous prime is 53993963. The next prime is 53993977. The reversal of 53993969 is 96939935.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 96939935 = 5 ⋅19387987.

It can be written as a sum of positive squares in 2 ways, for example, as 29866225 + 24127744 = 5465^2 + 4912^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53993969 is a prime.

It is a super-2 number, since 2×53993969² = 5830697376745922, which contains 22 as substring.

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 53993969.

It is not an unprimeable number, because it can be changed into a prime (53993963) 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, 930902 + ... + 930959.

It is an arithmetic number, because the mean of its divisors is an integer number (13963965).

Almost surely, 2^53993969 is an apocalyptic number.

It is an amenable number.

53993969 is a deficient number, since it is larger than the sum of its proper divisors (1861891).

53993969 is a wasteful number, since it uses less digits than its factorization.

53993969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1861890.

The product of its digits is 1771470, while the sum is 53.

The square root of 53993969 is about 7348.0588593179. The cubic root of 53993969 is about 377.9622429930.

The spelling of 53993969 in words is "fifty-three million, nine hundred ninety-three thousand, nine hundred sixty-nine".