1290074257 has 4 divisors (see below), whose sum is σ = 1365960996. Its totient is φ = 1214187520.

The previous prime is 1290074239. The next prime is 1290074263. The reversal of 1290074257 is 7524700921.

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 1117966096 + 172108161 = 33436^2 + 13119^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1290074257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1290074267) 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, 37943344 + ... + 37943377.

It is an arithmetic number, because the mean of its divisors is an integer number (341490249).

Almost surely, 2^1290074257 is an apocalyptic number.

1290074257 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1290074257 is a deficient number, since it is larger than the sum of its proper divisors (75886739).

1290074257 is an equidigital number, since it uses as much as digits as its factorization.

1290074257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75886738.

The product of its (nonzero) digits is 35280, while the sum is 37.

The square root of 1290074257 is about 35917.6037201816. The cubic root of 1290074257 is about 1088.6081207065.

The spelling of 1290074257 in words is "one billion, two hundred ninety million, seventy-four thousand, two hundred fifty-seven".