356400821 has 8 divisors (see below), whose sum is σ = 411348864. Its totient is φ = 302461200.

The previous prime is 356400817. The next prime is 356400839. The reversal of 356400821 is 128004653.

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

It is a cyclic number.

It is not a de Polignac number, because 356400821 - 2² = 356400817 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 (356400851) 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, 251345 + ... + 252758.

It is an arithmetic number, because the mean of its divisors is an integer number (51418608).

Almost surely, 2^356400821 is an apocalyptic number.

It is an amenable number.

356400821 is a deficient number, since it is larger than the sum of its proper divisors (54948043).

356400821 is a wasteful number, since it uses less digits than its factorization.

356400821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504211.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 356400821 is about 18878.5810112943. The cubic root of 356400821 is about 708.9999946951. Note that the first 5 decimals are identical.

The spelling of 356400821 in words is "three hundred fifty-six million, four hundred thousand, eight hundred twenty-one".