54639940 has 12 divisors (see below), whose sum is σ = 114743916. Its totient is φ = 21855968.

The previous prime is 54639931. The next prime is 54639947. The reversal of 54639940 is 4993645.

It can be written as a sum of positive squares in 2 ways, for example, as 15100996 + 39538944 = 3886^2 + 6288^2 .

It is a junction number, because it is equal to n+sod(n) for n = 54639893 and 54639902.

It is not an unprimeable number, because it can be changed into a prime (54639947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1365979 + ... + 1366018.

It is an arithmetic number, because the mean of its divisors is an integer number (9561993).

Almost surely, 2^54639940 is an apocalyptic number.

It is an amenable number.

54639940 is an abundant number, since it is smaller than the sum of its proper divisors (60103976).

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

54639940 is a wasteful number, since it uses less digits than its factorization.

54639940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2732006 (or 2732004 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 40.

The square root of 54639940 is about 7391.8833865261. The cubic root of 54639940 is about 379.4635551548.

The spelling of 54639940 in words is "fifty-four million, six hundred thirty-nine thousand, nine hundred forty".