1978907226 has 8 divisors (see below), whose sum is σ = 3957814464. Its totient is φ = 659635740.

The previous prime is 1978907213. The next prime is 1978907239. The reversal of 1978907226 is 6227098791.

It is an interprime number because it is at equal distance from previous prime (1978907213) and next prime (1978907239).

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

1978907226 is an admirable number.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon 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, 164908930 + ... + 164908941.

It is an arithmetic number, because the mean of its divisors is an integer number (494726808).

Almost surely, 2^1978907226 is an apocalyptic number.

1978907226 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1978907226 is a wasteful number, since it uses less digits than its factorization.

1978907226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329817876.

The product of its (nonzero) digits is 762048, while the sum is 51.

The square root of 1978907226 is about 44484.9100931990. The cubic root of 1978907226 is about 1255.4761823209.

The spelling of 1978907226 in words is "one billion, nine hundred seventy-eight million, nine hundred seven thousand, two hundred twenty-six".