1249805 has 8 divisors (see below), whose sum is σ = 1509144. Its totient is φ = 993600.

The previous prime is 1249799. The next prime is 1249811. The reversal of 1249805 is 5089421.

It is an interprime number because it is at equal distance from previous prime (1249799) and next prime (1249811).

It can be written as a sum of positive squares in 4 ways, for example, as 2116 + 1247689 = 46^2 + 1117^2 .

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

It is not a de Polignac number, because 1249805 - 2⁶ = 1249741 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215 + ... + 1595.

It is an arithmetic number, because the mean of its divisors is an integer number (188643).

2^1249805 is an apocalyptic number.

It is an amenable number.

1249805 is a deficient number, since it is larger than the sum of its proper divisors (259339).

1249805 is a wasteful number, since it uses less digits than its factorization.

1249805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1567.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 1249805 is about 1117.9467786974. The cubic root of 1249805 is about 107.7161326801.

The spelling of 1249805 in words is "one million, two hundred forty-nine thousand, eight hundred five".