407417921 has 4 divisors (see below), whose sum is σ = 407663700. Its totient is φ = 407172144.

The previous prime is 407417917. The next prime is 407417939. The reversal of 407417921 is 129714704.

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 265331521 + 142086400 = 16289^2 + 11920^2 .

It is a cyclic number.

It is not a de Polignac number, because 407417921 - 2² = 407417917 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (407417321) 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, 120386 + ... + 123723.

It is an arithmetic number, because the mean of its divisors is an integer number (101915925).

Almost surely, 2^407417921 is an apocalyptic number.

It is an amenable number.

407417921 is a deficient number, since it is larger than the sum of its proper divisors (245779).

407417921 is a wasteful number, since it uses less digits than its factorization.

407417921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245778.

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 407417921 is about 20184.5961317040. The cubic root of 407417921 is about 741.3330737163. Note that the first 3 decimals are identical.

The spelling of 407417921 in words is "four hundred seven million, four hundred seventeen thousand, nine hundred twenty-one".