55140040 has 16 divisors (see below), whose sum is σ = 124065180. Its totient is φ = 22056000.

The previous prime is 55140037. The next prime is 55140047. The reversal of 55140040 is 4004155.

55140040 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 50041476 + 5098564 = 7074^2 + 2258^2 .

It is a super-2 number, since 2×55140040² = 6080848022403200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55140047) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 689211 + ... + 689290.

Almost surely, 2^55140040 is an apocalyptic number.

It is an amenable number.

55140040 is an abundant number, since it is smaller than the sum of its proper divisors (68925140).

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

55140040 is a wasteful number, since it uses less digits than its factorization.

55140040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1378512 (or 1378508 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 55140040 is about 7425.6339796680. The cubic root of 55140040 is about 380.6177394689.

Adding to 55140040 its reverse (4004155), we get a palindrome (59144195).

The spelling of 55140040 in words is "fifty-five million, one hundred forty thousand, forty".