1400191790209 has 9 divisors (see below), whose sum is σ = 1439102594601. Its totient is φ = 1362306170160.

The previous prime is 1400191790177. The next prime is 1400191790227. The reversal of 1400191790209 is 9020971910041.

The square root of 1400191790209 is 1183297.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 9981009025 + 1390210781184 = 99905^2 + 1179072^2 .

It is not a de Polignac number, because 1400191790209 - 2⁵ = 1400191790177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1400191790279) 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 8 ways as a sum of consecutive naturals, for example, 43765999 + ... + 43797979.

It is an arithmetic number, because the mean of its divisors is an integer number (159900288289).

Almost surely, 2^{1400191790209} is an apocalyptic number.

1400191790209 is the 1183297-th square number.

1400191790209 is the 591649-th centered octagonal number.

It is an amenable number.

1400191790209 is a deficient number, since it is larger than the sum of its proper divisors (38910804392).

1400191790209 is an frugal number, since it uses more digits than its factorization.

1400191790209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64036 (or 32018 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 43.

It can be divided in two parts, 1400191 and 790209, that added together give a square (2190400 = 1480²).

The spelling of 1400191790209 in words is "one trillion, four hundred billion, one hundred ninety-one million, seven hundred ninety thousand, two hundred nine".