999920549440 has 56 divisors (see below), whose sum is σ = 2381154292800. Its totient is φ = 399952516608.

The previous prime is 999920549423. The next prime is 999920549449. The reversal of 999920549440 is 44945029999.

It is a super-2 number, since 2×999920549440² (a number of 25 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (64) 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 (64).

It is not an unprimeable number, because it can be changed into a prime (999920549449) 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, 11503261 + ... + 11589859.

Almost surely, 2^999920549440 is an apocalyptic number.

It is an amenable number.

999920549440 is an abundant number, since it is smaller than the sum of its proper divisors (1381233743360).

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

999920549440 is a wasteful number, since it uses less digits than its factorization.

999920549440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122699 (or 122689 counting only the distinct ones).

The product of its (nonzero) digits is 37791360, while the sum is 64.

The spelling of 999920549440 in words is "nine hundred ninety-nine billion, nine hundred twenty million, five hundred forty-nine thousand, four hundred forty".