1828120457 has 4 divisors (see below), whose sum is σ = 1877529156. Its totient is φ = 1778711760.

The previous prime is 1828120451. The next prime is 1828120471. The reversal of 1828120457 is 7540218281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7540218281 = 929 ⋅8116489.

It can be written as a sum of positive squares in 2 ways, for example, as 988222096 + 839898361 = 31436^2 + 28981^2 .

It is a cyclic number.

It is not a de Polignac number, because 1828120457 - 2¹² = 1828116361 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1828120457.

It is not an unprimeable number, because it can be changed into a prime (1828120451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24704294 + ... + 24704367.

It is an arithmetic number, because the mean of its divisors is an integer number (469382289).

Almost surely, 2^1828120457 is an apocalyptic number.

It is an amenable number.

1828120457 is a deficient number, since it is larger than the sum of its proper divisors (49408699).

1828120457 is an equidigital number, since it uses as much as digits as its factorization.

1828120457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49408698.

The product of its (nonzero) digits is 35840, while the sum is 38.

The square root of 1828120457 is about 42756.5253148569. The cubic root of 1828120457 is about 1222.7422987629.

The spelling of 1828120457 in words is "one billion, eight hundred twenty-eight million, one hundred twenty thousand, four hundred fifty-seven".