55940019 has 4 divisors (see below), whose sum is σ = 74586696. Its totient is φ = 37293344.

The previous prime is 55939991. The next prime is 55940057. The reversal of 55940019 is 91004955.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55940019 - 2¹⁵ = 55907251 is a prime.

It is a super-2 number, since 2×55940019² = 6258571451440722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55940099) 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, 9323334 + ... + 9323339.

It is an arithmetic number, because the mean of its divisors is an integer number (18646674).

Almost surely, 2^55940019 is an apocalyptic number.

55940019 is a deficient number, since it is larger than the sum of its proper divisors (18646677).

55940019 is a wasteful number, since it uses less digits than its factorization.

55940019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18646676.

The product of its (nonzero) digits is 8100, while the sum is 33.

The square root of 55940019 is about 7479.3060506975. The cubic root of 55940019 is about 382.4495930841.

The spelling of 55940019 in words is "fifty-five million, nine hundred forty thousand, nineteen".