1988294740 has 48 divisors (see below), whose sum is σ = 4339238400. Its totient is φ = 764461440.

The previous prime is 1988294719. The next prime is 1988294761. The reversal of 1988294740 is 474928891.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1988294719) and next prime (1988294761).

It is a super-2 number, since 2×1988294740² = 7906631946223335200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81619 + ... + 103141.

It is an arithmetic number, because the mean of its divisors is an integer number (90400800).

Almost surely, 2^1988294740 is an apocalyptic number.

1988294740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1988294740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2169619200).

1988294740 is an abundant number, since it is smaller than the sum of its proper divisors (2350943660).

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

1988294740 is a wasteful number, since it uses less digits than its factorization.

1988294740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21712 (or 21710 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 52.

The square root of 1988294740 is about 44590.2987206859. The cubic root of 1988294740 is about 1257.4582885060.

The spelling of 1988294740 in words is "one billion, nine hundred eighty-eight million, two hundred ninety-four thousand, seven hundred forty".