354406821 has 8 divisors (see below), whose sum is σ = 472664544. Its totient is φ = 236210160.

The previous prime is 354406799. The next prime is 354406841. The reversal of 354406821 is 128604453.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 354406821 - 2¹⁰ = 354405797 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (354406841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 651 + ... + 26631.

It is an arithmetic number, because the mean of its divisors is an integer number (59083068).

Almost surely, 2^354406821 is an apocalyptic number.

It is an amenable number.

354406821 is a deficient number, since it is larger than the sum of its proper divisors (118257723).

354406821 is a wasteful number, since it uses less digits than its factorization.

354406821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30531.

The product of its (nonzero) digits is 23040, while the sum is 33.

The square root of 354406821 is about 18825.6957640349. The cubic root of 354406821 is about 707.6752776114.

The spelling of 354406821 in words is "three hundred fifty-four million, four hundred six thousand, eight hundred twenty-one".