399354415 has 4 divisors (see below), whose sum is σ = 479225304. Its totient is φ = 319483528.

The previous prime is 399354409. The next prime is 399354427. The reversal of 399354415 is 514453993.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 399354415 - 2⁵ = 399354383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39935437 + ... + 39935446.

It is an arithmetic number, because the mean of its divisors is an integer number (119806326).

Almost surely, 2^399354415 is an apocalyptic number.

399354415 is a deficient number, since it is larger than the sum of its proper divisors (79870889).

399354415 is an equidigital number, since it uses as much as digits as its factorization.

399354415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79870888.

The product of its digits is 291600, while the sum is 43.

The square root of 399354415 is about 19983.8538575521. The cubic root of 399354415 is about 736.4096937032.

The spelling of 399354415 in words is "three hundred ninety-nine million, three hundred fifty-four thousand, four hundred fifteen".