1801978242 has 16 divisors (see below), whose sum is σ = 3613999680. Its totient is φ = 598985552.

The previous prime is 1801978237. The next prime is 1801978273. The reversal of 1801978242 is 2428791081.

It is a junction number, because it is equal to n+sod(n) for n = 1801978194 and 1801978203.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 416133 + ... + 420440.

It is an arithmetic number, because the mean of its divisors is an integer number (225874980).

Almost surely, 2^1801978242 is an apocalyptic number.

1801978242 is an abundant number, since it is smaller than the sum of its proper divisors (1812021438).

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

1801978242 is a wasteful number, since it uses less digits than its factorization.

1801978242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 836937.

The product of its (nonzero) digits is 64512, while the sum is 42.

The square root of 1801978242 is about 42449.7142746568. The cubic root of 1801978242 is about 1216.8858680883.

The spelling of 1801978242 in words is "one billion, eight hundred one million, nine hundred seventy-eight thousand, two hundred forty-two".