1025392978 has 16 divisors (see below), whose sum is σ = 1656171360. Its totient is φ = 474358336.

The previous prime is 1025392909. The next prime is 1025392987. The reversal of 1025392978 is 8792935201.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 253576 + ... + 257587.

It is an arithmetic number, because the mean of its divisors is an integer number (103510710).

Almost surely, 2^1025392978 is an apocalyptic number.

1025392978 is a deficient number, since it is larger than the sum of its proper divisors (630778382).

1025392978 is a wasteful number, since it uses less digits than its factorization.

1025392978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511241.

The product of its (nonzero) digits is 272160, while the sum is 46.

The square root of 1025392978 is about 32021.7578842886. The cubic root of 1025392978 is about 1008.3936750963.

The spelling of 1025392978 in words is "one billion, twenty-five million, three hundred ninety-two thousand, nine hundred seventy-eight".