55111940 has 24 divisors (see below), whose sum is σ = 124638360. Its totient is φ = 20348928.

The previous prime is 55111897. The next prime is 55111957. The reversal of 55111940 is 4911155.

It can be written as a sum of positive squares in 4 ways, for example, as 1295044 + 53816896 = 1138^2 + 7336^2 .

It is a super-3 number, since 3×55111940³ (a number of 24 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105725 + ... + 106244.

It is an arithmetic number, because the mean of its divisors is an integer number (5193265).

Almost surely, 2^55111940 is an apocalyptic number.

It is an amenable number.

55111940 is an abundant number, since it is smaller than the sum of its proper divisors (69526420).

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

55111940 is a wasteful number, since it uses less digits than its factorization.

55111940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211991 (or 211989 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 26.

The square root of 55111940 is about 7423.7416442115. The cubic root of 55111940 is about 380.5530727535.

The spelling of 55111940 in words is "fifty-five million, one hundred eleven thousand, nine hundred forty".