1390141997 has 4 divisors (see below), whose sum is σ = 1405761660. Its totient is φ = 1374522336.

The previous prime is 1390141979. The next prime is 1390142069. The reversal of 1390141997 is 7991410931.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 777628996 + 612513001 = 27886^2 + 24749^2 .

It is a cyclic number.

It is not a de Polignac number, because 1390141997 - 2⁸ = 1390141741 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 (1390141937) 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, 7809698 + ... + 7809875.

It is an arithmetic number, because the mean of its divisors is an integer number (351440415).

Almost surely, 2^1390141997 is an apocalyptic number.

It is an amenable number.

1390141997 is a deficient number, since it is larger than the sum of its proper divisors (15619663).

1390141997 is an equidigital number, since it uses as much as digits as its factorization.

1390141997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15619662.

The product of its (nonzero) digits is 61236, while the sum is 44.

The square root of 1390141997 is about 37284.6080440709. The cubic root of 1390141997 is about 1116.0570313497.

The spelling of 1390141997 in words is "one billion, three hundred ninety million, one hundred forty-one thousand, nine hundred ninety-seven".