55390907 has 16 divisors (see below), whose sum is σ = 65288160. Its totient is φ = 46329600.

The previous prime is 55390901. The next prime is 55390919. The reversal of 55390907 is 70909355.

It is a cyclic number.

It is not a de Polignac number, because 55390907 - 2⁴ = 55390891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55390901) 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, 72407 + ... + 73167.

It is an arithmetic number, because the mean of its divisors is an integer number (4080510).

Almost surely, 2^55390907 is an apocalyptic number.

55390907 is a deficient number, since it is larger than the sum of its proper divisors (9897253).

55390907 is a wasteful number, since it uses less digits than its factorization.

55390907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1294.

The product of its (nonzero) digits is 42525, while the sum is 38.

The square root of 55390907 is about 7442.5067685559. The cubic root of 55390907 is about 381.1940900903.

The spelling of 55390907 in words is "fifty-five million, three hundred ninety thousand, nine hundred seven".