1242978 has 32 divisors (see below), whose sum is σ = 2790720. Its totient is φ = 365760.

The previous prime is 1242977. The next prime is 1242979. The reversal of 1242978 is 8792421.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1242977) and next prime (1242979).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242977) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2188 + ... + 2696.

It is an arithmetic number, because the mean of its divisors is an integer number (87210).

2^1242978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1242978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1395360).

1242978 is an abundant number, since it is smaller than the sum of its proper divisors (1547742).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1242978 is a wasteful number, since it uses less digits than its factorization.

1242978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562.

The product of its digits is 8064, while the sum is 33.

The square root of 1242978 is about 1114.8892321661. The cubic root of 1242978 is about 107.5196430663.

The spelling of 1242978 in words is "one million, two hundred forty-two thousand, nine hundred seventy-eight".