399910540 has 36 divisors (see below), whose sum is σ = 867818448. Its totient is φ = 154796640.

The previous prime is 399910529. The next prime is 399910547. The reversal of 399910540 is 45019993.

It is a junction number, because it is equal to n+sod(n) for n = 399910493 and 399910502.

It is not an unprimeable number, because it can be changed into a prime (399910547) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8817 + ... + 29623.

It is an arithmetic number, because the mean of its divisors is an integer number (24106068).

Almost surely, 2^399910540 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399910540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (433909224).

399910540 is an abundant number, since it is smaller than the sum of its proper divisors (467907908).

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

399910540 is a wasteful number, since it uses less digits than its factorization.

399910540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20878 (or 20845 counting only the distinct ones).

The product of its (nonzero) digits is 43740, while the sum is 40.

The square root of 399910540 is about 19997.7633749377. The cubic root of 399910540 is about 736.7513667230.

The spelling of 399910540 in words is "three hundred ninety-nine million, nine hundred ten thousand, five hundred forty".