409770649 has 4 divisors (see below), whose sum is σ = 410058036. Its totient is φ = 409483264.

The previous prime is 409770637. The next prime is 409770653. The reversal of 409770649 is 946077904.

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 304851600 + 104919049 = 17460^2 + 10243^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-409770649 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 409770599 and 409770608.

It is not an unprimeable number, because it can be changed into a prime (409770629) 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, 141544 + ... + 144409.

It is an arithmetic number, because the mean of its divisors is an integer number (102514509).

Almost surely, 2^409770649 is an apocalyptic number.

It is an amenable number.

409770649 is a deficient number, since it is larger than the sum of its proper divisors (287387).

409770649 is a wasteful number, since it uses less digits than its factorization.

409770649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287386.

The product of its (nonzero) digits is 381024, while the sum is 46.

The square root of 409770649 is about 20242.7925198081. The cubic root of 409770649 is about 742.7573347997.

The spelling of 409770649 in words is "four hundred nine million, seven hundred seventy thousand, six hundred forty-nine".