7978949 has 4 divisors (see below), whose sum is σ = 8704320. Its totient is φ = 7253580.

The previous prime is 7978937. The next prime is 7978961. The reversal of 7978949 is 9498797.

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.

It is an interprime number because it is at equal distance from previous prime (7978937) and next prime (7978961).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7978949 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7978949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7978979) 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, 362669 + ... + 362690.

It is an arithmetic number, because the mean of its divisors is an integer number (2176080).

Almost surely, 2^7978949 is an apocalyptic number.

It is an amenable number.

7978949 is a deficient number, since it is larger than the sum of its proper divisors (725371).

7978949 is a wasteful number, since it uses less digits than its factorization.

7978949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725370.

The product of its digits is 1143072, while the sum is 53.

The square root of 7978949 is about 2824.7033472561. The cubic root of 7978949 is about 199.8244209050.

The spelling of 7978949 in words is "seven million, nine hundred seventy-eight thousand, nine hundred forty-nine".