996989940 has 72 divisors (see below), whose sum is σ = 3027253320. Its totient is φ = 265595904.

The previous prime is 996989923. The next prime is 996989951. The reversal of 996989940 is 49989699.

It can be written as a sum of positive squares in 4 ways, for example, as 235561104 + 761428836 = 15348^2 + 27594^2 .

It is a super-3 number, since 3×996989940³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 229872 + ... + 234168.

It is an arithmetic number, because the mean of its divisors is an integer number (42045185).

Almost surely, 2^996989940 is an apocalyptic number.

996989940 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

996989940 is an abundant number, since it is smaller than the sum of its proper divisors (2030263380).

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

996989940 is a wasteful number, since it uses less digits than its factorization.

996989940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5601 (or 5596 counting only the distinct ones).

The product of its (nonzero) digits is 11337408, while the sum is 63.

The square root of 996989940 is about 31575.1475055937. The cubic root of 996989940 is about 998.9956382619.

The spelling of 996989940 in words is "nine hundred ninety-six million, nine hundred eighty-nine thousand, nine hundred forty".