1392020491 has 2 divisors, whose sum is σ = 1392020492. Its totient is φ = 1392020490.

The previous prime is 1392020471. The next prime is 1392020543. The reversal of 1392020491 is 1940202931.

It is a weak prime.

It is an emirp because it is prime and its reverse (1940202931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1392020491 - 2¹⁷ = 1391889419 is a prime.

It is not a weakly prime, because it can be changed into another prime (1392020471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 696010245 + 696010246.

It is an arithmetic number, because the mean of its divisors is an integer number (696010246).

Almost surely, 2^1392020491 is an apocalyptic number.

1392020491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1392020491 is an equidigital number, since it uses as much as digits as its factorization.

1392020491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 1392020491 is about 37309.7908195691. The cubic root of 1392020491 is about 1116.5595130665.

The spelling of 1392020491 in words is "one billion, three hundred ninety-two million, twenty thousand, four hundred ninety-one".