123970821 has 8 divisors (see below), whose sum is σ = 178009440. Its totient is φ = 76289712.

The previous prime is 123970789. The next prime is 123970843. The reversal of 123970821 is 128079321.

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

It is not a de Polignac number, because 123970821 - 2⁵ = 123970789 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 (123970321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1589331 + ... + 1589408.

It is an arithmetic number, because the mean of its divisors is an integer number (22251180).

Almost surely, 2^123970821 is an apocalyptic number.

It is an amenable number.

123970821 is a deficient number, since it is larger than the sum of its proper divisors (54038619).

123970821 is a wasteful number, since it uses less digits than its factorization.

123970821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3178755.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 123970821 is about 11134.2184727982. The cubic root of 123970821 is about 498.6239779338.

The spelling of 123970821 in words is "one hundred twenty-three million, nine hundred seventy thousand, eight hundred twenty-one".