1820495401 has 8 divisors (see below), whose sum is σ = 1827657000. Its totient is φ = 1813347840.

The previous prime is 1820495399. The next prime is 1820495419. The reversal of 1820495401 is 1045940281.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 62789776 + 1757705625 = 7924^2 + 41925^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1820495401 - 2¹ = 1820495399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1820495441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 308325 + ... + 314173.

It is an arithmetic number, because the mean of its divisors is an integer number (228457125).

Almost surely, 2^1820495401 is an apocalyptic number.

It is an amenable number.

1820495401 is a deficient number, since it is larger than the sum of its proper divisors (7161599).

1820495401 is an equidigital number, since it uses as much as digits as its factorization.

1820495401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7019.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 1820495401 is about 42667.2638096234. The cubic root of 1820495401 is about 1221.0399179978.

The spelling of 1820495401 in words is "one billion, eight hundred twenty million, four hundred ninety-five thousand, four hundred one".