1220739 has 16 divisors (see below), whose sum is σ = 1774752. Its totient is φ = 741888.

The previous prime is 1220729. The next prime is 1220743. The reversal of 1220739 is 9370221.

It is not a de Polignac number, because 1220739 - 2¹¹ = 1218691 is a prime.

It is a super-2 number, since 2×1220739² = 2980407412242, which contains 22 as substring.

1220739 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1220729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4269 + ... + 4545.

It is an arithmetic number, because the mean of its divisors is an integer number (110922).

2^1220739 is an apocalyptic number.

1220739 is a deficient number, since it is larger than the sum of its proper divisors (554013).

1220739 is a wasteful number, since it uses less digits than its factorization.

1220739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406.

The product of its (nonzero) digits is 756, while the sum is 24.

The square root of 1220739 is about 1104.8705806564. The cubic root of 1220739 is about 106.8745436183.

It can be divided in two parts, 12207 and 39, that added together give a triangular number (12246 = T₁₅₆).

The spelling of 1220739 in words is "one million, two hundred twenty thousand, seven hundred thirty-nine".