1000378035721 has 9 divisors (see below), whose sum is σ = 1004460340429. Its totient is φ = 996312267436.

The previous prime is 1000378035707. The next prime is 1000378035779. The reversal of 1000378035721 is 1275308730001.

The square root of 1000378035721 is 1000189.

It is a perfect power (a square), and thus also a powerful number.

It is a de Polignac number, because none of the positive numbers 2^k-1000378035721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1000378032721) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 263047806 + ... + 263051608.

Almost surely, 2^{1000378035721} is an apocalyptic number.

1000378035721 is the 1000189-th square number.

1000378035721 is the 500095-th centered octagonal number.

It is an amenable number.

1000378035721 is a deficient number, since it is larger than the sum of its proper divisors (4082304708).

1000378035721 is an frugal number, since it uses more digits than its factorization.

1000378035721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8132 (or 4066 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 37.

The spelling of 1000378035721 in words is "one trillion, three hundred seventy-eight million, thirty-five thousand, seven hundred twenty-one".