1947470778 has 96 divisors (see below), whose sum is σ = 5001984000. Its totient is φ = 541015200.

The previous prime is 1947470773. The next prime is 1947470783. The reversal of 1947470778 is 8770747491.

It is an interprime number because it is at equal distance from previous prime (1947470773) and next prime (1947470783).

It is not an unprimeable number, because it can be changed into a prime (1947470773) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 108273 + ... + 124971.

It is an arithmetic number, because the mean of its divisors is an integer number (52104000).

Almost surely, 2^1947470778 is an apocalyptic number.

1947470778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1947470778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2500992000).

1947470778 is an abundant number, since it is smaller than the sum of its proper divisors (3054513222).

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

1947470778 is a wasteful number, since it uses less digits than its factorization.

1947470778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16768 (or 16765 counting only the distinct ones).

The product of its (nonzero) digits is 2765952, while the sum is 54.

The square root of 1947470778 is about 44130.1572396927. The cubic root of 1947470778 is about 1248.7926000972.

The spelling of 1947470778 in words is "one billion, nine hundred forty-seven million, four hundred seventy thousand, seven hundred seventy-eight".