1988813401 has 4 divisors (see below), whose sum is σ = 2052968704. Its totient is φ = 1924658100.

The previous prime is 1988813389. The next prime is 1988813479. The reversal of 1988813401 is 1043188891.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1988813401 - 2⁵ = 1988813369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1988819401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32077605 + ... + 32077666.

It is an arithmetic number, because the mean of its divisors is an integer number (513242176).

Almost surely, 2^1988813401 is an apocalyptic number.

It is an amenable number.

1988813401 is a deficient number, since it is larger than the sum of its proper divisors (64155303).

1988813401 is an equidigital number, since it uses as much as digits as its factorization.

1988813401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64155302.

The product of its (nonzero) digits is 55296, while the sum is 43.

The square root of 1988813401 is about 44596.1141917096. The cubic root of 1988813401 is about 1257.5676180165.

The spelling of 1988813401 in words is "one billion, nine hundred eighty-eight million, eight hundred thirteen thousand, four hundred one".