54781940 has 24 divisors (see below), whose sum is σ = 121097760. Its totient is φ = 20759328.

The previous prime is 54781897. The next prime is 54781943. The reversal of 54781940 is 4918745.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a junction number, because it is equal to n+sod(n) for n = 54781894 and 54781903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54781943) 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, 71702 + ... + 72461.

It is an arithmetic number, because the mean of its divisors is an integer number (5045740).

Almost surely, 2^54781940 is an apocalyptic number.

It is an amenable number.

54781940 is an abundant number, since it is smaller than the sum of its proper divisors (66315820).

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

54781940 is a wasteful number, since it uses less digits than its factorization.

54781940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144191 (or 144189 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 54781940 is about 7401.4822839753. The cubic root of 54781940 is about 379.7919914219.

The spelling of 54781940 in words is "fifty-four million, seven hundred eighty-one thousand, nine hundred forty".