390894780 has 48 divisors (see below), whose sum is σ = 1099242144. Its totient is φ = 103787520.

The previous prime is 390894773. The next prime is 390894851. The reversal of 390894780 is 87498093.

390894780 is a nontrivial binomial coefficient, being equal to C(27961, 2).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1 + ... + 27960.

It is an arithmetic number, because the mean of its divisors is an integer number (22900878).

Almost surely, 2^390894780 is an apocalyptic number.

390894780 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

390894780 is the 27960-th triangular number.

It is an amenable number.

390894780 is an abundant number, since it is smaller than the sum of its proper divisors (708347364).

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

390894780 is a wasteful number, since it uses less digits than its factorization.

390894780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28206 (or 28204 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 48.

The square root of 390894780 is about 19771.0591522053. The cubic root of 390894780 is about 731.1726820144.

The spelling of 390894780 in words is "three hundred ninety million, eight hundred ninety-four thousand, seven hundred eighty".