10278421 has 4 divisors (see below), whose sum is σ = 10883052. Its totient is φ = 9673792.

The previous prime is 10278397. The next prime is 10278431. The reversal of 10278421 is 12487201.

It is a happy number.

10278421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3591025 + 6687396 = 1895^2 + 2586^2 .

It is a cyclic number.

It is not a de Polignac number, because 10278421 - 2⁹ = 10277909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10278431) 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, 302290 + ... + 302323.

It is an arithmetic number, because the mean of its divisors is an integer number (2720763).

Almost surely, 2^10278421 is an apocalyptic number.

It is an amenable number.

10278421 is a deficient number, since it is larger than the sum of its proper divisors (604631).

10278421 is an equidigital number, since it uses as much as digits as its factorization.

10278421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604630.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 10278421 is about 3205.9976606355. The cubic root of 10278421 is about 217.4246605668.

The spelling of 10278421 in words is "ten million, two hundred seventy-eight thousand, four hundred twenty-one".