408661949 has 4 divisors (see below), whose sum is σ = 408882240. Its totient is φ = 408441660.

The previous prime is 408661931. The next prime is 408661969. The reversal of 408661949 is 949166804.

It is a happy number.

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 408661949 - 2¹⁶ = 408596413 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 (408661919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107339 + ... + 111080.

It is an arithmetic number, because the mean of its divisors is an integer number (102220560).

Almost surely, 2^408661949 is an apocalyptic number.

It is an amenable number.

408661949 is a deficient number, since it is larger than the sum of its proper divisors (220291).

408661949 is a wasteful number, since it uses less digits than its factorization.

408661949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220290.

The product of its (nonzero) digits is 373248, while the sum is 47.

The square root of 408661949 is about 20215.3889153783. The cubic root of 408661949 is about 742.0868468274.

The spelling of 408661949 in words is "four hundred eight million, six hundred sixty-one thousand, nine hundred forty-nine".