55190040 has 64 divisors (see below), whose sum is σ = 166060800. Its totient is φ = 14673792.

The previous prime is 55190029. The next prime is 55190071. The reversal of 55190040 is 4009155.

It is a Cunningham number, because it is equal to 7429²-1.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73909 + ... + 74651.

It is an arithmetic number, because the mean of its divisors is an integer number (2594700).

Almost surely, 2^55190040 is an apocalyptic number.

It is an amenable number.

55190040 is an abundant number, since it is smaller than the sum of its proper divisors (110870760).

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

55190040 is a wasteful number, since it uses less digits than its factorization.

55190040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1376 (or 1372 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 55190040 is about 7428.9999326962. Note that the first 4 decimals coincide. The cubic root of 55190040 is about 380.7327504941.

Adding to 55190040 its reverse (4009155), we get a palindrome (59199195).

The spelling of 55190040 in words is "fifty-five million, one hundred ninety thousand, forty".