1390611421 has 2 divisors, whose sum is σ = 1390611422. Its totient is φ = 1390611420.

The previous prime is 1390611319. The next prime is 1390611503. The reversal of 1390611421 is 1241160931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1117899225 + 272712196 = 33435^2 + 16514^2 .

It is an emirp because it is prime and its reverse (1241160931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1390611421 - 2⁹ = 1390610909 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1390611421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1390618421) 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 as a sum of consecutive naturals, namely, 695305710 + 695305711.

It is an arithmetic number, because the mean of its divisors is an integer number (695305711).

Almost surely, 2^1390611421 is an apocalyptic number.

It is an amenable number.

1390611421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1390611421 is an equidigital number, since it uses as much as digits as its factorization.

1390611421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 1390611421 is about 37290.9026573506. The cubic root of 1390611421 is about 1116.1826408192.

The spelling of 1390611421 in words is "one billion, three hundred ninety million, six hundred eleven thousand, four hundred twenty-one".