1945401369 has 4 divisors (see below), whose sum is σ = 2593868496. Its totient is φ = 1296934244.

The previous prime is 1945401343. The next prime is 1945401377. The reversal of 1945401369 is 9631045491.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1945401369 - 2⁹ = 1945400857 is a prime.

It is a super-2 number, since 2×1945401369² = 7569172973014148322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1945401369.

It is not an unprimeable number, because it can be changed into a prime (1945401319) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 324233559 + ... + 324233564.

It is an arithmetic number, because the mean of its divisors is an integer number (648467124).

Almost surely, 2^1945401369 is an apocalyptic number.

It is an amenable number.

1945401369 is a deficient number, since it is larger than the sum of its proper divisors (648467127).

1945401369 is an equidigital number, since it uses as much as digits as its factorization.

1945401369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648467126.

The product of its (nonzero) digits is 116640, while the sum is 42.

The square root of 1945401369 is about 44106.7043543269. The cubic root of 1945401369 is about 1248.3501153159.

The spelling of 1945401369 in words is "one billion, nine hundred forty-five million, four hundred one thousand, three hundred sixty-nine".