1020123985 has 16 divisors (see below), whose sum is σ = 1234148112. Its totient is φ = 809452800.

The previous prime is 1020123943. The next prime is 1020124013. The reversal of 1020123985 is 5893210201.

It can be written as a sum of positive squares in 8 ways, for example, as 19793601 + 1000330384 = 4449^2 + 31628^2 .

It is not a de Polignac number, because 1020123985 - 2⁹ = 1020123473 is a prime.

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, 737995 + ... + 739375.

It is an arithmetic number, because the mean of its divisors is an integer number (77134257).

Almost surely, 2^1020123985 is an apocalyptic number.

It is an amenable number.

1020123985 is a deficient number, since it is larger than the sum of its proper divisors (214024127).

1020123985 is a wasteful number, since it uses less digits than its factorization.

1020123985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2484.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 1020123985 is about 31939.3798468286. The cubic root of 1020123985 is about 1006.6634942203.

The spelling of 1020123985 in words is "one billion, twenty million, one hundred twenty-three thousand, nine hundred eighty-five".