409251397 has 4 divisors (see below), whose sum is σ = 427044960. Its totient is φ = 391457836.

The previous prime is 409251391. The next prime is 409251449. The reversal of 409251397 is 793152904.

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.

It is a cyclic number.

It is not a de Polignac number, because 409251397 - 2³ = 409251389 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 (409251391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8896747 + ... + 8896792.

It is an arithmetic number, because the mean of its divisors is an integer number (106761240).

Almost surely, 2^409251397 is an apocalyptic number.

It is an amenable number.

409251397 is a deficient number, since it is larger than the sum of its proper divisors (17793563).

409251397 is a wasteful number, since it uses less digits than its factorization.

409251397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17793562.

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 409251397 is about 20229.9628521656. The cubic root of 409251397 is about 742.4434671481.

The spelling of 409251397 in words is "four hundred nine million, two hundred fifty-one thousand, three hundred ninety-seven".