55540389 has 8 divisors (see below), whose sum is σ = 75097152. Its totient is φ = 36505280.

The previous prime is 55540379. The next prime is 55540399. The reversal of 55540389 is 98304555.

It is an interprime number because it is at equal distance from previous prime (55540379) and next prime (55540399).

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 55540389 - 2⁹ = 55539877 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55540319) 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, 130164 + ... + 130589.

It is an arithmetic number, because the mean of its divisors is an integer number (9387144).

Almost surely, 2^55540389 is an apocalyptic number.

It is an amenable number.

55540389 is a deficient number, since it is larger than the sum of its proper divisors (19556763).

55540389 is a wasteful number, since it uses less digits than its factorization.

55540389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260827.

The product of its (nonzero) digits is 108000, while the sum is 39.

The square root of 55540389 is about 7452.5424520763. The cubic root of 55540389 is about 381.5366882799.

The spelling of 55540389 in words is "fifty-five million, five hundred forty thousand, three hundred eighty-nine".