399380653 has 4 divisors (see below), whose sum is σ = 456435040. Its totient is φ = 342326268.

The previous prime is 399380651. The next prime is 399380659. The reversal of 399380653 is 356083993.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 356083993 = 97 ⋅3670969.

It is a cyclic number.

It is not a de Polignac number, because 399380653 - 2¹ = 399380651 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399380651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28527183 + ... + 28527196.

It is an arithmetic number, because the mean of its divisors is an integer number (114108760).

Almost surely, 2^399380653 is an apocalyptic number.

It is an amenable number.

399380653 is a deficient number, since it is larger than the sum of its proper divisors (57054387).

399380653 is an equidigital number, since it uses as much as digits as its factorization.

399380653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57054386.

The product of its (nonzero) digits is 524880, while the sum is 46.

The square root of 399380653 is about 19984.5103267506. The cubic root of 399380653 is about 736.4258209774.

The spelling of 399380653 in words is "three hundred ninety-nine million, three hundred eighty thousand, six hundred fifty-three".