55140938 has 4 divisors (see below), whose sum is σ = 82711410. Its totient is φ = 27570468.

The previous prime is 55140937. The next prime is 55140961. The reversal of 55140938 is 83904155.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83904155 = 5 ⋅16780831.

It can be written as a sum of positive squares in only one way, i.e., 48260809 + 6880129 = 6947^2 + 2623^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 55140898 and 55140907.

It is not an unprimeable number, because it can be changed into a prime (55140931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13785233 + ... + 13785236.

Almost surely, 2^55140938 is an apocalyptic number.

55140938 is a deficient number, since it is larger than the sum of its proper divisors (27570472).

55140938 is a wasteful number, since it uses less digits than its factorization.

55140938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27570471.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 55140938 is about 7425.6944456394. The cubic root of 55140938 is about 380.6198056799.

The spelling of 55140938 in words is "fifty-five million, one hundred forty thousand, nine hundred thirty-eight".