1978126045 has 16 divisors (see below), whose sum is σ = 2724716160. Its totient is φ = 1350500544.

The previous prime is 1978126037. The next prime is 1978126061. The reversal of 1978126045 is 5406218791.

It is a cyclic number.

It is not a de Polignac number, because 1978126045 - 2³ = 1978126037 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1978125992 and 1978126010.

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, 115387 + ... + 131416.

It is an arithmetic number, because the mean of its divisors is an integer number (170294760).

Almost surely, 2^1978126045 is an apocalyptic number.

It is an amenable number.

1978126045 is a deficient number, since it is larger than the sum of its proper divisors (746590115).

1978126045 is a wasteful number, since it uses less digits than its factorization.

1978126045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247044.

The product of its (nonzero) digits is 120960, while the sum is 43.

The square root of 1978126045 is about 44476.1289345195. The cubic root of 1978126045 is about 1255.3109592780.

The spelling of 1978126045 in words is "one billion, nine hundred seventy-eight million, one hundred twenty-six thousand, forty-five".