919978340 has 24 divisors (see below), whose sum is σ = 1960792512. Its totient is φ = 362498400.

The previous prime is 919978337. The next prime is 919978369. The reversal of 919978340 is 43879919.

919978340 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 341936 + ... + 344615.

It is an arithmetic number, because the mean of its divisors is an integer number (81699688).

Almost surely, 2^919978340 is an apocalyptic number.

It is an amenable number.

919978340 is an abundant number, since it is smaller than the sum of its proper divisors (1040814172).

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

919978340 is a wasteful number, since it uses less digits than its factorization.

919978340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686627 (or 686625 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 50.

The square root of 919978340 is about 30331.1447195783. The cubic root of 919978340 is about 972.5811934510.

The spelling of 919978340 in words is "nine hundred nineteen million, nine hundred seventy-eight thousand, three hundred forty".