19077985 has 4 divisors (see below), whose sum is σ = 22893588. Its totient is φ = 15262384.

The previous prime is 19077979. The next prime is 19078013. The reversal of 19077985 is 58977091.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58977091 = 293 ⋅201287.

It can be written as a sum of positive squares in 2 ways, for example, as 6110784 + 12967201 = 2472^2 + 3601^2 .

It is a cyclic number.

It is not a de Polignac number, because 19077985 - 2⁵ = 19077953 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1907794 + ... + 1907803.

It is an arithmetic number, because the mean of its divisors is an integer number (5723397).

Almost surely, 2^19077985 is an apocalyptic number.

It is an amenable number.

19077985 is a deficient number, since it is larger than the sum of its proper divisors (3815603).

19077985 is an equidigital number, since it uses as much as digits as its factorization.

19077985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3815602.

The product of its (nonzero) digits is 158760, while the sum is 46.

The square root of 19077985 is about 4367.8352761980. The cubic root of 19077985 is about 267.2047459999.

The spelling of 19077985 in words is "nineteen million, seventy-seven thousand, nine hundred eighty-five".