1940405 has 4 divisors (see below), whose sum is σ = 2328492. Its totient is φ = 1552320.

The previous prime is 1940401. The next prime is 1940423. The reversal of 1940405 is 5040491.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 195364 + 1745041 = 442^2 + 1321^2 .

It is not a de Polignac number, because 1940405 - 2² = 1940401 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1940401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 194036 + ... + 194045.

It is an arithmetic number, because the mean of its divisors is an integer number (582123).

2^1940405 is an apocalyptic number.

It is an amenable number.

1940405 is a deficient number, since it is larger than the sum of its proper divisors (388087).

1940405 is an equidigital number, since it uses as much as digits as its factorization.

1940405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388086.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 1940405 is about 1392.9842066585. The cubic root of 1940405 is about 124.7280487693.

Adding to 1940405 its reverse (5040491), we get a palindrome (6980896).

The spelling of 1940405 in words is "one million, nine hundred forty thousand, four hundred five".