1380291 has 16 divisors (see below), whose sum is σ = 2028288. Its totient is φ = 828000.

The previous prime is 1380289. The next prime is 1380307. The reversal of 1380291 is 1920831.

1380291 is a nontrivial binomial coefficient, being equal to C(1662, 2).

It is not a de Polignac number, because 1380291 - 2¹ = 1380289 is a prime.

1380291 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1380221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4845 + ... + 5121.

It is an arithmetic number, because the mean of its divisors is an integer number (126768).

2^1380291 is an apocalyptic number.

1380291 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1380291 is the 1661-st triangular number and also the 831-st hexagonal number.

1380291 is a deficient number, since it is larger than the sum of its proper divisors (647997).

1380291 is a wasteful number, since it uses less digits than its factorization.

1380291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 1380291 is about 1174.8578637435. The cubic root of 1380291 is about 111.3414532267.

The spelling of 1380291 in words is "one million, three hundred eighty thousand, two hundred ninety-one".