1253709 has 6 divisors (see below), whose sum is σ = 1810926. Its totient is φ = 835800.

The previous prime is 1253701. The next prime is 1253717. The reversal of 1253709 is 9073521.

It is an interprime number because it is at equal distance from previous prime (1253701) and next prime (1253717).

It can be written as a sum of positive squares in only one way, i.e., 1232100 + 21609 = 1110^2 + 147^2 .

It is not a de Polignac number, because 1253709 - 2³ = 1253701 is a prime.

1253709 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1253701) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 69642 + ... + 69659.

It is an arithmetic number, because the mean of its divisors is an integer number (301821).

2^1253709 is an apocalyptic number.

It is an amenable number.

1253709 is a deficient number, since it is larger than the sum of its proper divisors (557217).

1253709 is a wasteful number, since it uses less digits than its factorization.

1253709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139307 (or 139304 counting only the distinct ones).

The product of its (nonzero) digits is 1890, while the sum is 27.

The square root of 1253709 is about 1119.6914753627. The cubic root of 1253709 is about 107.8281732727.

Adding to 1253709 its sum of digits (27), we get a triangular number (1253736 = T₁₅₈₃).

The spelling of 1253709 in words is "one million, two hundred fifty-three thousand, seven hundred nine".