1978292485 has 8 divisors (see below), whose sum is σ = 2556562680. Its totient is φ = 1460892864.

The previous prime is 1978292453. The next prime is 1978292489. The reversal of 1978292485 is 5842928791.

It is a Cunningham number, because it is equal to 44478²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1 + 1978292484 = 1^2 + 44478^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1978292485 - 2⁵ = 1978292453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978292489) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15217570 + ... + 15217699.

It is an arithmetic number, because the mean of its divisors is an integer number (319570335).

Almost surely, 2^1978292485 is an apocalyptic number.

It is an amenable number.

1978292485 is a deficient number, since it is larger than the sum of its proper divisors (578270195).

1978292485 is a wasteful number, since it uses less digits than its factorization.

1978292485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30435287.

The product of its digits is 2903040, while the sum is 55.

The square root of 1978292485 is about 44478.0000112415. Note that the first 4 decimals coincide. The cubic root of 1978292485 is about 1255.3461656791.

The spelling of 1978292485 in words is "one billion, nine hundred seventy-eight million, two hundred ninety-two thousand, four hundred eighty-five".