1989626652 has 72 divisors (see below), whose sum is σ = 5616841776. Its totient is φ = 612188928.

The previous prime is 1989626647. The next prime is 1989626659. The reversal of 1989626652 is 2566269891.

It is a happy number.

1989626652 is a `hidden beast` number, since 1 + 9 + 8 + 9 + 626 + 6 + 5 + 2 = 666.

It is a super-2 number, since 2×1989626652² = 7917228428697458208, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989626659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66093 + ... + 91364.

Almost surely, 2^1989626652 is an apocalyptic number.

1989626652 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1989626652 is an abundant number, since it is smaller than the sum of its proper divisors (3627215124).

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

1989626652 is a wasteful number, since it uses less digits than its factorization.

1989626652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157489 (or 157475 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 54.

The square root of 1989626652 is about 44605.2312178740. The cubic root of 1989626652 is about 1257.7390064355.

The spelling of 1989626652 in words is "one billion, nine hundred eighty-nine million, six hundred twenty-six thousand, six hundred fifty-two".