7478149 has 4 divisors (see below), whose sum is σ = 8546464. Its totient is φ = 6409836.

The previous prime is 7478137. The next prime is 7478189. The reversal of 7478149 is 9418747.

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: 9418747 = 13 ⋅724519.

It is a cyclic number.

It is not a de Polignac number, because 7478149 - 2⁵ = 7478117 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7478129) 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 in 3 ways as a sum of consecutive naturals, for example, 534147 + ... + 534160.

It is an arithmetic number, because the mean of its divisors is an integer number (2136616).

Almost surely, 2^7478149 is an apocalyptic number.

It is an amenable number.

7478149 is a deficient number, since it is larger than the sum of its proper divisors (1068315).

7478149 is a wasteful number, since it uses less digits than its factorization.

7478149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1068314.

The product of its digits is 56448, while the sum is 40.

The square root of 7478149 is about 2734.6204489837. The cubic root of 7478149 is about 195.5530998721.

The spelling of 7478149 in words is "seven million, four hundred seventy-eight thousand, one hundred forty-nine".