407646749 has 4 divisors (see below), whose sum is σ = 408249564. Its totient is φ = 407043936.

The previous prime is 407646721. The next prime is 407646769. The reversal of 407646749 is 947646704.

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

It can be written as a sum of positive squares in 2 ways, for example, as 295668025 + 111978724 = 17195^2 + 10582^2 .

It is a cyclic number.

It is not a de Polignac number, because 407646749 - 2²⁰ = 406598173 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 (407646719) 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, 300392 + ... + 301745.

It is an arithmetic number, because the mean of its divisors is an integer number (102062391).

Almost surely, 2^407646749 is an apocalyptic number.

It is an amenable number.

407646749 is a deficient number, since it is larger than the sum of its proper divisors (602815).

407646749 is an equidigital number, since it uses as much as digits as its factorization.

407646749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 602814.

The product of its (nonzero) digits is 1016064, while the sum is 47.

The square root of 407646749 is about 20190.2637179409. The cubic root of 407646749 is about 741.4718386932.

The spelling of 407646749 in words is "four hundred seven million, six hundred forty-six thousand, seven hundred forty-nine".