999961940 has 24 divisors (see below), whose sum is σ = 2100547680. Its totient is φ = 399865248.

The previous prime is 999961939. The next prime is 999961943. The reversal of 999961940 is 49169999.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999961943) 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, 96239 + ... + 106121.

It is an arithmetic number, because the mean of its divisors is an integer number (87522820).

Almost surely, 2^999961940 is an apocalyptic number.

It is an amenable number.

999961940 is an abundant number, since it is smaller than the sum of its proper divisors (1100585740).

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

999961940 is a wasteful number, since it uses less digits than its factorization.

999961940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14951 (or 14949 counting only the distinct ones).

The product of its (nonzero) digits is 1417176, while the sum is 56.

The square root of 999961940 is about 31622.1748145190. The cubic root of 999961940 is about 999.9873131724.

The spelling of 999961940 in words is "nine hundred ninety-nine million, nine hundred sixty-one thousand, nine hundred forty".