2478947 has 4 divisors (see below), whose sum is σ = 2486400. Its totient is φ = 2471496.

The previous prime is 2478937. The next prime is 2478953. The reversal of 2478947 is 7498742.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7498742 = 2 ⋅3749371.

It is a cyclic number.

It is not a de Polignac number, because 2478947 - 2⁸ = 2478691 is a prime.

It is a super-2 number, since 2×2478947² = 12290356457618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2478937) 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, 3203 + ... + 3900.

It is an arithmetic number, because the mean of its divisors is an integer number (621600).

2^2478947 is an apocalyptic number.

2478947 is a deficient number, since it is larger than the sum of its proper divisors (7453).

2478947 is an equidigital number, since it uses as much as digits as its factorization.

2478947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7452.

The product of its digits is 112896, while the sum is 41.

The square root of 2478947 is about 1574.4672114719. The cubic root of 2478947 is about 135.3388288083.

The spelling of 2478947 in words is "two million, four hundred seventy-eight thousand, nine hundred forty-seven".