399387340 has 24 divisors (see below), whose sum is σ = 914960592. Its totient is φ = 145231680.

The previous prime is 399387337. The next prime is 399387367. The reversal of 399387340 is 43783993.

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, 907479 + ... + 907918.

It is an arithmetic number, because the mean of its divisors is an integer number (38123358).

Almost surely, 2^399387340 is an apocalyptic number.

It is an amenable number.

399387340 is an abundant number, since it is smaller than the sum of its proper divisors (515573252).

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

399387340 is a wasteful number, since it uses less digits than its factorization.

399387340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1815417 (or 1815415 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 46.

The square root of 399387340 is about 19984.6776306249. The cubic root of 399387340 is about 736.4299310513.

It can be divided in two parts, 39938 and 7340, that added together give a triangular number (47278 = T₃₀₇).

The spelling of 399387340 in words is "three hundred ninety-nine million, three hundred eighty-seven thousand, three hundred forty".