1988865057 has 8 divisors (see below), whose sum is σ = 2652455520. Its totient is φ = 1325592320.

The previous prime is 1988865049. The next prime is 1988865059. The reversal of 1988865057 is 7505688891.

It is a happy number.

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 1988865057 - 2³ = 1988865049 is a prime.

It is a super-2 number, since 2×1988865057² = 7911168429911226498, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1988864988 and 1988865006.

It is not an unprimeable number, because it can be changed into a prime (1988865059) 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, 64419 + ... + 90152.

It is an arithmetic number, because the mean of its divisors is an integer number (331556940).

Almost surely, 2^1988865057 is an apocalyptic number.

It is an amenable number.

1988865057 is a deficient number, since it is larger than the sum of its proper divisors (663590463).

1988865057 is a wasteful number, since it uses less digits than its factorization.

1988865057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158863.

The product of its (nonzero) digits is 4838400, while the sum is 57.

The square root of 1988865057 is about 44596.6933415472. The cubic root of 1988865057 is about 1257.5785056393.

The spelling of 1988865057 in words is "one billion, nine hundred eighty-eight million, eight hundred sixty-five thousand, fifty-seven".