7241978 has 4 divisors (see below), whose sum is σ = 10862970. Its totient is φ = 3620988.

The previous prime is 7241977. The next prime is 7241989. The reversal of 7241978 is 8791427.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8791427 = 137 ⋅64171.

It can be written as a sum of positive squares in only one way, i.e., 7059649 + 182329 = 2657^2 + 427^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7241977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1810493 + ... + 1810496.

Almost surely, 2^7241978 is an apocalyptic number.

7241978 is a deficient number, since it is larger than the sum of its proper divisors (3620992).

7241978 is a wasteful number, since it uses less digits than its factorization.

7241978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3620991.

The product of its digits is 28224, while the sum is 38.

The square root of 7241978 is about 2691.0923432688. The cubic root of 7241978 is about 193.4724213823.

The spelling of 7241978 in words is "seven million, two hundred forty-one thousand, nine hundred seventy-eight".