55783438 has 8 divisors (see below), whose sum is σ = 85093560. Its totient is φ = 27418920.

The previous prime is 55783433. The next prime is 55783447. The reversal of 55783438 is 83438755.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×55783438² = 6223583910199688, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55783394 and 55783403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55783433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 236253 + ... + 236488.

It is an arithmetic number, because the mean of its divisors is an integer number (10636695).

Almost surely, 2^55783438 is an apocalyptic number.

55783438 is a deficient number, since it is larger than the sum of its proper divisors (29310122).

55783438 is a wasteful number, since it uses less digits than its factorization.

55783438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472802.

The product of its digits is 403200, while the sum is 43.

The square root of 55783438 is about 7468.8310999781. The cubic root of 55783438 is about 382.0924230194.

The spelling of 55783438 in words is "fifty-five million, seven hundred eighty-three thousand, four hundred thirty-eight".