1213739 has 8 divisors (see below), whose sum is σ = 1290240. Its totient is φ = 1138536.

The previous prime is 1213721. The next prime is 1213741. The reversal of 1213739 is 9373121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1213739 - 2⁸ = 1213483 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213759) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2162 + ... + 2664.

It is an arithmetic number, because the mean of its divisors is an integer number (161280).

2^1213739 is an apocalyptic number.

1213739 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1213739 is a deficient number, since it is larger than the sum of its proper divisors (76501).

1213739 is a wasteful number, since it uses less digits than its factorization.

1213739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649.

The product of its digits is 1134, while the sum is 26.

The square root of 1213739 is about 1101.6982345452. The cubic root of 1213739 is about 106.6698707805.

The spelling of 1213739 in words is "one million, two hundred thirteen thousand, seven hundred thirty-nine".