1391912197 has 8 divisors (see below), whose sum is σ = 1499542016. Its totient is φ = 1284362352.

The previous prime is 1391912189. The next prime is 1391912201. The reversal of 1391912197 is 7912191931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1391912197 - 2³ = 1391912189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391912117) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18988 + ... + 56074.

It is an arithmetic number, because the mean of its divisors is an integer number (187442752).

Almost surely, 2^1391912197 is an apocalyptic number.

It is an amenable number.

1391912197 is a deficient number, since it is larger than the sum of its proper divisors (107629819).

1391912197 is a wasteful number, since it uses less digits than its factorization.

1391912197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39987.

The product of its digits is 30618, while the sum is 43.

The square root of 1391912197 is about 37308.3395100881. The cubic root of 1391912197 is about 1116.5305575943.

The spelling of 1391912197 in words is "one billion, three hundred ninety-one million, nine hundred twelve thousand, one hundred ninety-seven".