1978453 has 4 divisors (see below), whose sum is σ = 1985728. Its totient is φ = 1971180.

The previous prime is 1978441. The next prime is 1978463. The reversal of 1978453 is 3548791.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3548791 = 59 ⋅60149.

It is a cyclic number.

It is not a de Polignac number, because 1978453 - 2⁵ = 1978421 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 (1978423) 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, 3213 + ... + 3778.

It is an arithmetic number, because the mean of its divisors is an integer number (496432).

2^1978453 is an apocalyptic number.

It is an amenable number.

1978453 is a deficient number, since it is larger than the sum of its proper divisors (7275).

1978453 is an equidigital number, since it uses as much as digits as its factorization.

1978453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7274.

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

The square root of 1978453 is about 1406.5749180189. The cubic root of 1978453 is about 125.5380116918.

The spelling of 1978453 in words is "one million, nine hundred seventy-eight thousand, four hundred fifty-three".