398652407 has 4 divisors (see below), whose sum is σ = 403698720. Its totient is φ = 393606096.

The previous prime is 398652347. The next prime is 398652409. The reversal of 398652407 is 704256893.

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 398652407 - 2²⁰ = 397603831 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 (398652409) 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, 2523038 + ... + 2523195.

It is an arithmetic number, because the mean of its divisors is an integer number (100924680).

Almost surely, 2^398652407 is an apocalyptic number.

398652407 is a deficient number, since it is larger than the sum of its proper divisors (5046313).

398652407 is an equidigital number, since it uses as much as digits as its factorization.

398652407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5046312.

The product of its (nonzero) digits is 362880, while the sum is 44.

The square root of 398652407 is about 19966.2817519938. The cubic root of 398652407 is about 735.9779396103.

The spelling of 398652407 in words is "three hundred ninety-eight million, six hundred fifty-two thousand, four hundred seven".