1872240778 has 4 divisors (see below), whose sum is σ = 2808361170. Its totient is φ = 936120388.

The previous prime is 1872240763. The next prime is 1872240793. The reversal of 1872240778 is 8770422781.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1872240763) and next prime (1872240793).

It can be written as a sum of positive squares in only one way, i.e., 1864771489 + 7469289 = 43183^2 + 2733^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 468060193 + ... + 468060196.

Almost surely, 2^1872240778 is an apocalyptic number.

1872240778 is a deficient number, since it is larger than the sum of its proper divisors (936120392).

1872240778 is an equidigital number, since it uses as much as digits as its factorization.

1872240778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 936120391.

The product of its (nonzero) digits is 351232, while the sum is 46.

The square root of 1872240778 is about 43269.3977078489. The cubic root of 1872240778 is about 1232.5008667382.

The spelling of 1872240778 in words is "one billion, eight hundred seventy-two million, two hundred forty thousand, seven hundred seventy-eight".