1988190823 has 2 divisors, whose sum is σ = 1988190824. Its totient is φ = 1988190822.

The previous prime is 1988190811. The next prime is 1988190899. The reversal of 1988190823 is 3280918891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1988190823 - 2¹³ = 1988182631 is a prime.

It is a super-2 number, since 2×1988190823² = 7905805497322834658, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1988190223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 994095411 + 994095412.

It is an arithmetic number, because the mean of its divisors is an integer number (994095412).

Almost surely, 2^1988190823 is an apocalyptic number.

1988190823 is a deficient number, since it is larger than the sum of its proper divisors (1).

1988190823 is an equidigital number, since it uses as much as digits as its factorization.

1988190823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 248832, while the sum is 49.

The square root of 1988190823 is about 44589.1334632105. The cubic root of 1988190823 is about 1257.4363813633.

The spelling of 1988190823 in words is "one billion, nine hundred eighty-eight million, one hundred ninety thousand, eight hundred twenty-three".