55397940 has 48 divisors (see below), whose sum is σ = 167048448. Its totient is φ = 13636224.

The previous prime is 55397933. The next prime is 55397957. The reversal of 55397940 is 4979355.

55397940 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 55397892 and 55397901.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34732 + ... + 36291.

It is an arithmetic number, because the mean of its divisors is an integer number (3480176).

Almost surely, 2^55397940 is an apocalyptic number.

It is an amenable number.

55397940 is an abundant number, since it is smaller than the sum of its proper divisors (111650508).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55397940 is a wasteful number, since it uses less digits than its factorization.

55397940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71048 (or 71046 counting only the distinct ones).

The product of its (nonzero) digits is 170100, while the sum is 42.

The square root of 55397940 is about 7442.9792422121. The cubic root of 55397940 is about 381.2102228500.

The spelling of 55397940 in words is "fifty-five million, three hundred ninety-seven thousand, nine hundred forty".