1978507107 has 64 divisors (see below), whose sum is σ = 3379968000. Its totient is φ = 1135378944.

The previous prime is 1978507043. The next prime is 1978507129. The reversal of 1978507107 is 7017058791.

It is a happy number.

It is not a de Polignac number, because 1978507107 - 2⁶ = 1978507043 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1978507007) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 248998 + ... + 256820.

It is an arithmetic number, because the mean of its divisors is an integer number (52812000).

Almost surely, 2^1978507107 is an apocalyptic number.

1978507107 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1978507107 is a deficient number, since it is larger than the sum of its proper divisors (1401460893).

1978507107 is a wasteful number, since it uses less digits than its factorization.

1978507107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7897 (or 7891 counting only the distinct ones).

The product of its (nonzero) digits is 123480, while the sum is 45.

The square root of 1978507107 is about 44480.4126217372. The cubic root of 1978507107 is about 1255.3915609150.

The spelling of 1978507107 in words is "one billion, nine hundred seventy-eight million, five hundred seven thousand, one hundred seven".