1247642 has 8 divisors (see below), whose sum is σ = 2041632. Its totient is φ = 567100.

The previous prime is 1247641. The next prime is 1247651. The reversal of 1247642 is 2467421.

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

It is a super-2 number, since 2×1247642² = 3113221120328, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1247641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28334 + ... + 28377.

It is an arithmetic number, because the mean of its divisors is an integer number (255204).

2^1247642 is an apocalyptic number.

1247642 is a deficient number, since it is larger than the sum of its proper divisors (793990).

1247642 is a wasteful number, since it uses less digits than its factorization.

1247642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56724.

The product of its digits is 2688, while the sum is 26.

The square root of 1247642 is about 1116.9789613059. The cubic root of 1247642 is about 107.6539564382.

The spelling of 1247642 in words is "one million, two hundred forty-seven thousand, six hundred forty-two".