55390 has 16 divisors (see below), whose sum is σ = 103680. Its totient is φ = 21280.

The previous prime is 55381. The next prime is 55399. The reversal of 55390 is 9355.

It is an interprime number because it is at equal distance from previous prime (55381) and next prime (55399).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55399) 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, 195 + ... + 385.

It is an arithmetic number, because the mean of its divisors is an integer number (6480).

2⁵⁵³⁹⁰ is an apocalyptic number.

55390 is a deficient number, since it is larger than the sum of its proper divisors (48290).

55390 is a wasteful number, since it uses less digits than its factorization.

55390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227.

The product of its (nonzero) digits is 675, while the sum is 22.

The square root of 55390 is about 235.3508019957. The cubic root of 55390 is about 38.1192009454.

Adding to 55390 its product of nonzero digits (675), we get a palindrome (56065).

It can be divided in two parts, 553 and 90, that multiplied together give a triangular number (49770 = T₃₁₅).

The spelling of 55390 in words is "fifty-five thousand, three hundred ninety".