1988738654 has 16 divisors (see below), whose sum is σ = 3557495808. Its totient is φ = 815259192.

The previous prime is 1988738651. The next prime is 1988738699. The reversal of 1988738654 is 4568378891.

1988738654 = T₃₅₆ + T₃₅₇ + ... + T₂₂₈₇.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1988738593 and 1988738602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1988738651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3087782 + ... + 3088425.

It is an arithmetic number, because the mean of its divisors is an integer number (222343488).

Almost surely, 2^1988738654 is an apocalyptic number.

1988738654 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1988738654 is a deficient number, since it is larger than the sum of its proper divisors (1568757154).

1988738654 is a wasteful number, since it uses less digits than its factorization.

1988738654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6176239.

The product of its digits is 11612160, while the sum is 59.

The square root of 1988738654 is about 44595.2761399680. The cubic root of 1988738654 is about 1257.5518631306.

The spelling of 1988738654 in words is "one billion, nine hundred eighty-eight million, seven hundred thirty-eight thousand, six hundred fifty-four".