1945778814 has 32 divisors (see below), whose sum is σ = 4941661440. Its totient is φ = 555936696.

The previous prime is 1945778801. The next prime is 1945778827. The reversal of 1945778814 is 4188775491.

It is an interprime number because it is at equal distance from previous prime (1945778801) and next prime (1945778827).

It is a super-2 number, since 2×1945778814² = 7572110386022493192, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2573404 + ... + 2574159.

It is an arithmetic number, because the mean of its divisors is an integer number (154426920).

Almost surely, 2^1945778814 is an apocalyptic number.

1945778814 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1945778814 is an abundant number, since it is smaller than the sum of its proper divisors (2995882626).

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

1945778814 is a wasteful number, since it uses less digits than its factorization.

1945778814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5147581 (or 5147575 counting only the distinct ones).

The product of its digits is 2257920, while the sum is 54.

The square root of 1945778814 is about 44110.9829180897. The cubic root of 1945778814 is about 1248.4308446788.

The spelling of 1945778814 in words is "one billion, nine hundred forty-five million, seven hundred seventy-eight thousand, eight hundred fourteen".