399354405 has 32 divisors (see below), whose sum is σ = 668196864. Its totient is φ = 203286336.

The previous prime is 399354383. The next prime is 399354409. The reversal of 399354405 is 504453993.

It is a happy number.

It is not a de Polignac number, because 399354405 - 2⁶ = 399354341 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399354409) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 208462 + ... + 210368.

It is an arithmetic number, because the mean of its divisors is an integer number (20881152).

Almost surely, 2^399354405 is an apocalyptic number.

It is an amenable number.

399354405 is a deficient number, since it is larger than the sum of its proper divisors (268842459).

399354405 is a wasteful number, since it uses less digits than its factorization.

399354405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2545.

The product of its (nonzero) digits is 291600, while the sum is 42.

The square root of 399354405 is about 19983.8536073501. The cubic root of 399354405 is about 736.4096875566.

The spelling of 399354405 in words is "three hundred ninety-nine million, three hundred fifty-four thousand, four hundred five".