1971403945 has 16 divisors (see below), whose sum is σ = 2821190400. Its totient is φ = 1293044544.

The previous prime is 1971403939. The next prime is 1971403969. The reversal of 1971403945 is 5493041791.

It is not a de Polignac number, because 1971403945 - 2³ = 1971403937 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1223670 + ... + 1225279.

It is an arithmetic number, because the mean of its divisors is an integer number (176324400).

Almost surely, 2^1971403945 is an apocalyptic number.

It is an amenable number.

1971403945 is a deficient number, since it is larger than the sum of its proper divisors (849786455).

1971403945 is a wasteful number, since it uses less digits than its factorization.

1971403945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2448984.

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 1971403945 is about 44400.4948733682. The cubic root of 1971403945 is about 1253.8874061926.

The spelling of 1971403945 in words is "one billion, nine hundred seventy-one million, four hundred three thousand, nine hundred forty-five".