1978955226 has 80 divisors (see below), whose sum is σ = 4536686880. Its totient is φ = 644565600.

The previous prime is 1978955219. The next prime is 1978955233. The reversal of 1978955226 is 6225598791.

1978955226 is a `hidden beast` number, since 1 + 9 + 7 + 89 + 552 + 2 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (1978955219) and next prime (1978955233).

It is a super-2 number, since 2×1978955226² = 7832527573025422152, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1882401 + ... + 1883451.

It is an arithmetic number, because the mean of its divisors is an integer number (56708586).

Almost surely, 2^1978955226 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1978955226, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2268343440).

1978955226 is an abundant number, since it is smaller than the sum of its proper divisors (2557731654).

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

1978955226 is a wasteful number, since it uses less digits than its factorization.

1978955226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1321 (or 1312 counting only the distinct ones).

The product of its digits is 2721600, while the sum is 54.

The square root of 1978955226 is about 44485.4495987171. The cubic root of 1978955226 is about 1255.4863331032.

The spelling of 1978955226 in words is "one billion, nine hundred seventy-eight million, nine hundred fifty-five thousand, two hundred twenty-six".