342946821 has 48 divisors (see below), whose sum is σ = 547491840. Its totient is φ = 187012800.

The previous prime is 342946817. The next prime is 342946841. The reversal of 342946821 is 128649243.

It is not a de Polignac number, because 342946821 - 2² = 342946817 is a prime.

It is a super-2 number, since 2×342946821² = 235225044068012082, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 342946821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (342946811) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2271096 + ... + 2271246.

It is an arithmetic number, because the mean of its divisors is an integer number (11406080).

Almost surely, 2^342946821 is an apocalyptic number.

It is an amenable number.

342946821 is a deficient number, since it is larger than the sum of its proper divisors (204545019).

342946821 is a wasteful number, since it uses less digits than its factorization.

342946821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314 (or 277 counting only the distinct ones).

The product of its digits is 82944, while the sum is 39.

The square root of 342946821 is about 18518.8234237491. The cubic root of 342946821 is about 699.9638219398.

The spelling of 342946821 in words is "three hundred forty-two million, nine hundred forty-six thousand, eight hundred twenty-one".