1989751554 has 224 divisors, whose sum is σ = 5573775360. Its totient is φ = 519631200.

The previous prime is 1989751541. The next prime is 1989751559. The reversal of 1989751554 is 4551579891.

It is a happy number.

1989751554 is a `hidden beast` number, since 1 + 9 + 89 + 7 + 5 + 1 + 554 = 666.

It is a super-2 number, since 2×1989751554² = 7918222493290829832, which contains 22 as substring.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1989751554.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989751559) by changing a digit.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 6011169 + ... + 6011499.

Almost surely, 2^1989751554 is an apocalyptic number.

1989751554 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1989751554, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2786887680).

1989751554 is an abundant number, since it is smaller than the sum of its proper divisors (3584023806).

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

1989751554 is a wasteful number, since it uses less digits than its factorization.

1989751554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408 (or 393 counting only the distinct ones).

The product of its digits is 2268000, while the sum is 54.

The square root of 1989751554 is about 44606.6312783200. The cubic root of 1989751554 is about 1257.7653247450.

The spelling of 1989751554 in words is "one billion, nine hundred eighty-nine million, seven hundred fifty-one thousand, five hundred fifty-four".