1018729840 has 40 divisors (see below), whose sum is σ = 2493210960. Its totient is φ = 386044416.

The previous prime is 1018729759. The next prime is 1018729847. The reversal of 1018729840 is 489278101.

It is a happy number.

1018729840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 1018729793 and 1018729802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1018729847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 333589 + ... + 336628.

It is an arithmetic number, because the mean of its divisors is an integer number (62330274).

Almost surely, 2^1018729840 is an apocalyptic number.

1018729840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1018729840 is an abundant number, since it is smaller than the sum of its proper divisors (1474481120).

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

1018729840 is a wasteful number, since it uses less digits than its factorization.

1018729840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670249 (or 670243 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 40.

The square root of 1018729840 is about 31917.5475248334. The cubic root of 1018729840 is about 1006.2047020489.

The spelling of 1018729840 in words is "one billion, eighteen million, seven hundred twenty-nine thousand, eight hundred forty".