1973021378 has 4 divisors (see below), whose sum is σ = 2959532070. Its totient is φ = 986510688.

The previous prime is 1973021357. The next prime is 1973021387. The reversal of 1973021378 is 8731203791.

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

It can be written as a sum of positive squares in only one way, i.e., 1638387529 + 334633849 = 40477^2 + 18293^2 .

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 as a sum of consecutive naturals, namely, 493255343 + ... + 493255346.

Almost surely, 2^1973021378 is an apocalyptic number.

1973021378 is a deficient number, since it is larger than the sum of its proper divisors (986510692).

1973021378 is an equidigital number, since it uses as much as digits as its factorization.

1973021378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 986510691.

The product of its (nonzero) digits is 63504, while the sum is 41.

The square root of 1973021378 is about 44418.7052715407. The cubic root of 1973021378 is about 1254.2302286235.

The spelling of 1973021378 in words is "one billion, nine hundred seventy-three million, twenty-one thousand, three hundred seventy-eight".