1409978 has 4 divisors (see below), whose sum is σ = 2114970. Its totient is φ = 704988.

The previous prime is 1409977. The next prime is 1409999. The reversal of 1409978 is 8799041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8799041 = 23 ⋅382567.

It can be written as a sum of positive squares in only one way, i.e., 1385329 + 24649 = 1177^2 + 157^2 .

It is not an unprimeable number, because it can be changed into a prime (1409977) by changing a digit.

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 as a sum of consecutive naturals, namely, 352493 + ... + 352496.

2^1409978 is an apocalyptic number.

1409978 is a deficient number, since it is larger than the sum of its proper divisors (704992).

1409978 is an equidigital number, since it uses as much as digits as its factorization.

1409978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704991.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 1409978 is about 1187.4249449965. The cubic root of 1409978 is about 112.1340338363.

The spelling of 1409978 in words is "one million, four hundred nine thousand, nine hundred seventy-eight".