1988525690 has 32 divisors (see below), whose sum is σ = 3719692800. Its totient is φ = 764568000.

The previous prime is 1988525681. The next prime is 1988525699. The reversal of 1988525690 is 965258891.

It is an interprime number because it is at equal distance from previous prime (1988525681) and next prime (1988525699).

It is a super-2 number, since 2×1988525690² = 7908468839579952200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1988525699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24665 + ... + 67715.

It is an arithmetic number, because the mean of its divisors is an integer number (116240400).

Almost surely, 2^1988525690 is an apocalyptic number.

1988525690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1988525690 is a deficient number, since it is larger than the sum of its proper divisors (1731167110).

1988525690 is a wasteful number, since it uses less digits than its factorization.

1988525690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43238.

The product of its (nonzero) digits is 1555200, while the sum is 53.

The square root of 1988525690 is about 44592.8883343521. Note that the first 3 decimals coincide. The cubic root of 1988525690 is about 1257.5069732311.

The spelling of 1988525690 in words is "one billion, nine hundred eighty-eight million, five hundred twenty-five thousand, six hundred ninety".