2012691978 has 36 divisors (see below), whose sum is σ = 4793317074. Its totient is φ = 609906000.

The previous prime is 2012691973. The next prime is 2012692001. The reversal of 2012691978 is 8791962102.

It can be written as a sum of positive squares in only one way, i.e., 1837579689 + 175112289 = 42867^2 + 13233^2 .

It is not an unprimeable number, because it can be changed into a prime (2012691973) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 459873 + ... + 464228.

Almost surely, 2^2012691978 is an apocalyptic number.

2012691978 is an abundant number, since it is smaller than the sum of its proper divisors (2780625096).

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

2012691978 is a wasteful number, since it uses less digits than its factorization.

2012691978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 924131 (or 924117 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 2012691978 is about 44863.0357644241. The cubic root of 2012691978 is about 1262.5805803941.

The spelling of 2012691978 in words is "two billion, twelve million, six hundred ninety-one thousand, nine hundred seventy-eight".