1988013929 has 4 divisors (see below), whose sum is σ = 2168742480. Its totient is φ = 1807285380.

The previous prime is 1988013899. The next prime is 1988013953. The reversal of 1988013929 is 9293108891.

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 a de Polignac number, because none of the positive numbers 2^k-1988013929 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1988013029) 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, 90364259 + ... + 90364280.

It is an arithmetic number, because the mean of its divisors is an integer number (542185620).

Almost surely, 2^1988013929 is an apocalyptic number.

It is an amenable number.

1988013929 is a deficient number, since it is larger than the sum of its proper divisors (180728551).

1988013929 is a wasteful number, since it uses less digits than its factorization.

1988013929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180728550.

The product of its (nonzero) digits is 279936, while the sum is 50.

The square root of 1988013929 is about 44587.1498192024. The cubic root of 1988013929 is about 1257.3990879027.

The spelling of 1988013929 in words is "one billion, nine hundred eighty-eight million, thirteen thousand, nine hundred twenty-nine".