1520378823 has 32 divisors (see below), whose sum is σ = 2091241152. Its totient is φ = 982195200.

The previous prime is 1520378819. The next prime is 1520378869. The reversal of 1520378823 is 3288730251.

It is not a de Polignac number, because 1520378823 - 2² = 1520378819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1520378813) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6525115 + ... + 6525347.

It is an arithmetic number, because the mean of its divisors is an integer number (65351286).

Almost surely, 2^1520378823 is an apocalyptic number.

1520378823 is a deficient number, since it is larger than the sum of its proper divisors (570862329).

1520378823 is a wasteful number, since it uses less digits than its factorization.

1520378823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675.

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 1520378823 is about 38992.0353790361. The cubic root of 1520378823 is about 1149.8749260320.

The spelling of 1520378823 in words is "one billion, five hundred twenty million, three hundred seventy-eight thousand, eight hundred twenty-three".