1390520811 has 4 divisors (see below), whose sum is σ = 1854027752. Its totient is φ = 927013872.

The previous prime is 1390520801. The next prime is 1390520839. The reversal of 1390520811 is 1180250931.

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

It is not a de Polignac number, because 1390520811 - 2²³ = 1382132203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1390520801) 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, 231753466 + ... + 231753471.

It is an arithmetic number, because the mean of its divisors is an integer number (463506938).

Almost surely, 2^1390520811 is an apocalyptic number.

1390520811 is a deficient number, since it is larger than the sum of its proper divisors (463506941).

1390520811 is an equidigital number, since it uses as much as digits as its factorization.

1390520811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463506940.

The product of its (nonzero) digits is 2160, while the sum is 30.

The square root of 1390520811 is about 37289.6877299878. The cubic root of 1390520811 is about 1116.1583974051.

It can be divided in two parts, 13905 and 20811, that added together give a triangular number (34716 = T₂₆₃).

The spelling of 1390520811 in words is "one billion, three hundred ninety million, five hundred twenty thousand, eight hundred eleven".