55418387 has 2 divisors, whose sum is σ = 55418388. Its totient is φ = 55418386.

The previous prime is 55418381. The next prime is 55418401. The reversal of 55418387 is 78381455.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55418387 - 2⁸ = 55418131 is a prime.

It is not a weakly prime, because it can be changed into another prime (55418381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27709193 + 27709194.

It is an arithmetic number, because the mean of its divisors is an integer number (27709194).

Almost surely, 2^55418387 is an apocalyptic number.

55418387 is a deficient number, since it is larger than the sum of its proper divisors (1).

55418387 is an equidigital number, since it uses as much as digits as its factorization.

55418387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 134400, while the sum is 41.

The square root of 55418387 is about 7444.3526918061. The cubic root of 55418387 is about 381.2571177745.

The spelling of 55418387 in words is "fifty-five million, four hundred eighteen thousand, three hundred eighty-seven".