2478257 has 2 divisors, whose sum is σ = 2478258. Its totient is φ = 2478256.

The previous prime is 2478241. The next prime is 2478269. The reversal of 2478257 is 7528742.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2421136 + 57121 = 1556^2 + 239^2 .

It is a cyclic number.

It is not a de Polignac number, because 2478257 - 2⁴ = 2478241 is a prime.

It is a super-2 number, since 2×2478257² = 12283515516098, which contains 22 as substring.

It is a Chen prime.

It is a d-powerful number, because it can be written as 2¹⁰ + 4⁴ + 7 + 8⁶ + 2²¹ + 5² + 7⁶ .

It is not a weakly prime, because it can be changed into another prime (2478557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1239128 + 1239129.

It is an arithmetic number, because the mean of its divisors is an integer number (1239129).

2^2478257 is an apocalyptic number.

It is an amenable number.

2478257 is a deficient number, since it is larger than the sum of its proper divisors (1).

2478257 is an equidigital number, since it uses as much as digits as its factorization.

2478257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31360, while the sum is 35.

The square root of 2478257 is about 1574.2480744787. The cubic root of 2478257 is about 135.3262707265.

The spelling of 2478257 in words is "two million, four hundred seventy-eight thousand, two hundred fifty-seven".