1390923191 has 8 divisors (see below), whose sum is σ = 1590228384. Its totient is φ = 1191768480.

The previous prime is 1390923181. The next prime is 1390923199. The reversal of 1390923191 is 1913290931.

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

It is a de Polignac number, because none of the positive numbers 2^k-1390923191 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 (1390923199) 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, 17060 + ... + 55433.

It is an arithmetic number, because the mean of its divisors is an integer number (198778548).

Almost surely, 2^1390923191 is an apocalyptic number.

1390923191 is a deficient number, since it is larger than the sum of its proper divisors (199305193).

1390923191 is an equidigital number, since it uses as much as digits as its factorization.

1390923191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75241.

The product of its (nonzero) digits is 13122, while the sum is 38.

The square root of 1390923191 is about 37295.0826651450. The cubic root of 1390923191 is about 1116.2660492763.

The spelling of 1390923191 in words is "one billion, three hundred ninety million, nine hundred twenty-three thousand, one hundred ninety-one".