354290821 has 4 divisors (see below), whose sum is σ = 357426252. Its totient is φ = 351155392.

The previous prime is 354290819. The next prime is 354290831. The reversal of 354290821 is 128092453.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 128092453 = 8803 ⋅14551.

It can be written as a sum of positive squares in 2 ways, for example, as 3290596 + 351000225 = 1814^2 + 18735^2 .

It is a cyclic number.

It is not a de Polignac number, because 354290821 - 2¹ = 354290819 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 (354290831) 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, 1567546 + ... + 1567771.

It is an arithmetic number, because the mean of its divisors is an integer number (89356563).

Almost surely, 2^354290821 is an apocalyptic number.

It is an amenable number.

354290821 is a deficient number, since it is larger than the sum of its proper divisors (3135431).

354290821 is a wasteful number, since it uses less digits than its factorization.

354290821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3135430.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 354290821 is about 18822.6146164660. The cubic root of 354290821 is about 707.5980600512.

The spelling of 354290821 in words is "three hundred fifty-four million, two hundred ninety thousand, eight hundred twenty-one".