1978435 has 4 divisors (see below), whose sum is σ = 2374128. Its totient is φ = 1582744.

The previous prime is 1978433. The next prime is 1978439. The reversal of 1978435 is 5348791.

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

It is a cyclic number.

It is not a de Polignac number, because 1978435 - 2¹ = 1978433 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1978394 and 1978403.

It is not an unprimeable number, because it can be changed into a prime (1978433) 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, 197839 + ... + 197848.

It is an arithmetic number, because the mean of its divisors is an integer number (593532).

2^1978435 is an apocalyptic number.

1978435 is a deficient number, since it is larger than the sum of its proper divisors (395693).

1978435 is an equidigital number, since it uses as much as digits as its factorization.

1978435 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395692.

The product of its digits is 30240, while the sum is 37.

The square root of 1978435 is about 1406.5685194828. The cubic root of 1978435 is about 125.5376309749.

The spelling of 1978435 in words is "one million, nine hundred seventy-eight thousand, four hundred thirty-five".