51993430 has 16 divisors (see below), whose sum is σ = 93926304. Its totient is φ = 20722240.

The previous prime is 51993397. The next prime is 51993437. The reversal of 51993430 is 3439915.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51993437) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6442 + ... + 12061.

It is an arithmetic number, because the mean of its divisors is an integer number (5870394).

Almost surely, 2^51993430 is an apocalyptic number.

51993430 is a deficient number, since it is larger than the sum of its proper divisors (41932874).

51993430 is a wasteful number, since it uses less digits than its factorization.

51993430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18791.

The product of its (nonzero) digits is 14580, while the sum is 34.

The square root of 51993430 is about 7210.6469890017. The cubic root of 51993430 is about 373.2353954053.

The spelling of 51993430 in words is "fifty-one million, nine hundred ninety-three thousand, four hundred thirty".