399421548 has 36 divisors (see below), whose sum is σ = 1010672208. Its totient is φ = 133005600.

The previous prime is 399421543. The next prime is 399421567. The reversal of 399421548 is 845124993.

399421548 is a `hidden beast` number, since 399 + 4 + 215 + 48 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (399421541) 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, 34273 + ... + 44423.

It is an arithmetic number, because the mean of its divisors is an integer number (28074228).

Almost surely, 2^399421548 is an apocalyptic number.

It is an amenable number.

399421548 is an abundant number, since it is smaller than the sum of its proper divisors (611250660).

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

399421548 is a wasteful number, since it uses less digits than its factorization.

399421548 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11254 (or 11249 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 399421548 is about 19985.5334679863. The cubic root of 399421548 is about 736.4509558171.

The spelling of 399421548 in words is "three hundred ninety-nine million, four hundred twenty-one thousand, five hundred forty-eight".