1944758978 has 6 divisors (see below), whose sum is σ = 2917232019. Its totient is φ = 972348306.

The previous prime is 1944758957. The next prime is 1944758987. The reversal of 1944758978 is 8798574491.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 972379489 + 972379489 = 31183^2 + 31183^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=31183.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1944758978.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 46775 + ... + 77957.

Almost surely, 2^1944758978 is an apocalyptic number.

1944758978 is a deficient number, since it is larger than the sum of its proper divisors (972473041).

1944758978 is an frugal number, since it uses more digits than its factorization.

1944758978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62368 (or 31185 counting only the distinct ones).

The product of its digits is 20321280, while the sum is 62.

The square root of 1944758978 is about 44099.4215154802. The cubic root of 1944758978 is about 1248.2126942887.

The spelling of 1944758978 in words is "one billion, nine hundred forty-four million, seven hundred fifty-eight thousand, nine hundred seventy-eight".