1988356090 has 64 divisors (see below), whose sum is σ = 4202150400. Its totient is φ = 663183360.

The previous prime is 1988356081. The next prime is 1988356147. The reversal of 1988356090 is 906538891.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1287859 + ... + 1289401.

It is an arithmetic number, because the mean of its divisors is an integer number (65658600).

Almost surely, 2^1988356090 is an apocalyptic number.

1988356090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1988356090 is an abundant number, since it is smaller than the sum of its proper divisors (2213794310).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1988356090 is a wasteful number, since it uses less digits than its factorization.

1988356090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2047.

The product of its (nonzero) digits is 466560, while the sum is 49.

The square root of 1988356090 is about 44590.9866452852. The cubic root of 1988356090 is about 1257.4712215772.

The spelling of 1988356090 in words is "one billion, nine hundred eighty-eight million, three hundred fifty-six thousand, ninety".