55306405 has 16 divisors (see below), whose sum is σ = 82744704. Its totient is φ = 34476480.

The previous prime is 55306403. The next prime is 55306409. The reversal of 55306405 is 50460355.

It is not a de Polignac number, because 55306405 - 2¹ = 55306403 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55306403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71442 + ... + 72211.

It is an arithmetic number, because the mean of its divisors is an integer number (5171544).

Almost surely, 2^55306405 is an apocalyptic number.

55306405 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

55306405 is a deficient number, since it is larger than the sum of its proper divisors (27438299).

55306405 is a wasteful number, since it uses less digits than its factorization.

55306405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143676.

The product of its (nonzero) digits is 9000, while the sum is 28.

The square root of 55306405 is about 7436.8276166656. The cubic root of 55306405 is about 381.0001469632. Note that the first 3 decimals are identical.

It can be divided in two parts, 5530 and 6405, that added together give a triangular number (11935 = T₁₅₄).

The spelling of 55306405 in words is "fifty-five million, three hundred six thousand, four hundred five".