1578947 has 4 divisors (see below), whose sum is σ = 1584336. Its totient is φ = 1573560.

The previous prime is 1578931. The next prime is 1578961. The reversal of 1578947 is 7498751.

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 1578947 - 2⁴ = 1578931 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1578047) 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, 2228 + ... + 2849.

It is an arithmetic number, because the mean of its divisors is an integer number (396084).

2^1578947 is an apocalyptic number.

1578947 is a deficient number, since it is larger than the sum of its proper divisors (5389).

1578947 is an equidigital number, since it uses as much as digits as its factorization.

1578947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5388.

The product of its digits is 70560, while the sum is 41.

The square root of 1578947 is about 1256.5615782762. The cubic root of 1578947 is about 116.4454483743.

The spelling of 1578947 in words is "one million, five hundred seventy-eight thousand, nine hundred forty-seven".