55212405 has 16 divisors (see below), whose sum is σ = 88594560. Its totient is φ = 29361728.

The previous prime is 55212401. The next prime is 55212427. The reversal of 55212405 is 50421255.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 55212405 - 2² = 55212401 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55212401) 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, 259 + ... + 10511.

It is an arithmetic number, because the mean of its divisors is an integer number (5537160).

Almost surely, 2^55212405 is an apocalyptic number.

It is an amenable number.

55212405 is a deficient number, since it is larger than the sum of its proper divisors (33382155).

55212405 is a wasteful number, since it uses less digits than its factorization.

55212405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10620.

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 55212405 is about 7430.5050299424. The cubic root of 55212405 is about 380.7841724415.

The spelling of 55212405 in words is "fifty-five million, two hundred twelve thousand, four hundred five".