1243978 has 8 divisors (see below), whose sum is σ = 1947168. Its totient is φ = 594924.

The previous prime is 1243969. The next prime is 1243997. The reversal of 1243978 is 8793421.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13476 + ... + 13567.

It is an arithmetic number, because the mean of its divisors is an integer number (243396).

2^1243978 is an apocalyptic number.

1243978 is a deficient number, since it is larger than the sum of its proper divisors (703190).

1243978 is a wasteful number, since it uses less digits than its factorization.

1243978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27068.

The product of its digits is 12096, while the sum is 34.

The square root of 1243978 is about 1115.3376170470. The cubic root of 1243978 is about 107.5484692193.

The spelling of 1243978 in words is "one million, two hundred forty-three thousand, nine hundred seventy-eight".