1820252478 has 32 divisors (see below), whose sum is σ = 4180487040. Its totient is φ = 522560160.

The previous prime is 1820252471. The next prime is 1820252491. The reversal of 1820252478 is 8742520281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820252471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 724525 + ... + 727032.

It is an arithmetic number, because the mean of its divisors is an integer number (130640220).

Almost surely, 2^1820252478 is an apocalyptic number.

1820252478 is an abundant number, since it is smaller than the sum of its proper divisors (2360234562).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1820252478 is a wasteful number, since it uses less digits than its factorization.

1820252478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1451592.

The product of its (nonzero) digits is 71680, while the sum is 39.

The square root of 1820252478 is about 42664.4170005873. The cubic root of 1820252478 is about 1220.9856045997.

The spelling of 1820252478 in words is "one billion, eight hundred twenty million, two hundred fifty-two thousand, four hundred seventy-eight".