55906405 has 8 divisors (see below), whose sum is σ = 67127832. Its totient is φ = 44698368.

The previous prime is 55906397. The next prime is 55906441. The reversal of 55906405 is 50460955.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 9897316 + 46009089 = 3146^2 + 6783^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 55906405 - 2³ = 55906397 is a prime.

It is a super-2 number, since 2×55906405² = 6251052240048050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 14569 + ... + 18001.

It is an arithmetic number, because the mean of its divisors is an integer number (8390979).

Almost surely, 2^55906405 is an apocalyptic number.

It is an amenable number.

55906405 is a deficient number, since it is larger than the sum of its proper divisors (11221427).

55906405 is a wasteful number, since it uses less digits than its factorization.

55906405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6695.

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 55906405 is about 7477.0585794148. The cubic root of 55906405 is about 382.3729738965.

The spelling of 55906405 in words is "fifty-five million, nine hundred six thousand, four hundred five".