1242673278 has 64 divisors (see below), whose sum is σ = 3106460160. Its totient is φ = 321955200.

The previous prime is 1242673249. The next prime is 1242673291. The reversal of 1242673278 is 8723762421.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 191308 + ... + 197696.

It is an arithmetic number, because the mean of its divisors is an integer number (48538440).

Almost surely, 2^1242673278 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1242673278, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1553230080).

1242673278 is an abundant number, since it is smaller than the sum of its proper divisors (1863786882).

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

1242673278 is a wasteful number, since it uses less digits than its factorization.

1242673278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6833.

The product of its digits is 225792, while the sum is 42.

The square root of 1242673278 is about 35251.5712841286. The cubic root of 1242673278 is about 1075.1085603003.

The spelling of 1242673278 in words is "one billion, two hundred forty-two million, six hundred seventy-three thousand, two hundred seventy-eight".