19790385 has 16 divisors (see below), whose sum is σ = 31744896. Its totient is φ = 10528128.

The previous prime is 19790371. The next prime is 19790387. The reversal of 19790385 is 58309791.

It is a happy number.

It is not a de Polignac number, because 19790385 - 2⁷ = 19790257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19790387) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5412 + ... + 8298.

It is an arithmetic number, because the mean of its divisors is an integer number (1984056).

Almost surely, 2^19790385 is an apocalyptic number.

19790385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19790385 is a deficient number, since it is larger than the sum of its proper divisors (11954511).

19790385 is a wasteful number, since it uses less digits than its factorization.

19790385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3352.

The product of its (nonzero) digits is 68040, while the sum is 42.

The square root of 19790385 is about 4448.6385557831. The cubic root of 19790385 is about 270.4901248384.

The spelling of 19790385 in words is "nineteen million, seven hundred ninety thousand, three hundred eighty-five".