19394145 has 12 divisors (see below), whose sum is σ = 33616596. Its totient is φ = 10343520.

The previous prime is 19394143. The next prime is 19394149. The reversal of 19394145 is 54149391.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 4717584 + 14676561 = 2172^2 + 3831^2 .

It is not a de Polignac number, because 19394145 - 2¹ = 19394143 is a prime.

It is a super-2 number, since 2×19394145² = 752265720562050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (19394143) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 215446 + ... + 215535.

It is an arithmetic number, because the mean of its divisors is an integer number (2801383).

Almost surely, 2^19394145 is an apocalyptic number.

19394145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19394145 is a deficient number, since it is larger than the sum of its proper divisors (14222451).

19394145 is a wasteful number, since it uses less digits than its factorization.

19394145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430992 (or 430989 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 19394145 is about 4403.8784043159. The cubic root of 19394145 is about 268.6727039290.

It can be divided in two parts, 1939 and 4145, that added together give a square (6084 = 78²).

The spelling of 19394145 in words is "nineteen million, three hundred ninety-four thousand, one hundred forty-five".