55442405 has 8 divisors (see below), whose sum is σ = 67442712. Its totient is φ = 43746048.

The previous prime is 55442383. The next prime is 55442407. The reversal of 55442405 is 50424455.

It can be written as a sum of positive squares in 4 ways, for example, as 22287841 + 33154564 = 4721^2 + 5758^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55442405 - 2⁶ = 55442341 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55442407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75584 + ... + 76313.

It is an arithmetic number, because the mean of its divisors is an integer number (8430339).

Almost surely, 2^55442405 is an apocalyptic number.

It is an amenable number.

55442405 is a deficient number, since it is larger than the sum of its proper divisors (12000307).

55442405 is a wasteful number, since it uses less digits than its factorization.

55442405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151975.

The product of its (nonzero) digits is 16000, while the sum is 29.

The square root of 55442405 is about 7445.9656861954. The cubic root of 55442405 is about 381.3121880102.

The spelling of 55442405 in words is "fifty-five million, four hundred forty-two thousand, four hundred five".