623926421 has 4 divisors (see below), whose sum is σ = 626131392. Its totient is φ = 621721452.

The previous prime is 623926411. The next prime is 623926423. The reversal of 623926421 is 124629326.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 124629326 = 2 ⋅62314663.

It is a cyclic number.

It is not a de Polignac number, because 623926421 - 2¹⁰ = 623925397 is a prime.

It is a super-3 number, since 3×623926421³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (623926423) 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 3 ways as a sum of consecutive naturals, for example, 1102061 + ... + 1102626.

It is an arithmetic number, because the mean of its divisors is an integer number (156532848).

Almost surely, 2^623926421 is an apocalyptic number.

It is an amenable number.

623926421 is a deficient number, since it is larger than the sum of its proper divisors (2204971).

623926421 is a wasteful number, since it uses less digits than its factorization.

623926421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2204970.

The product of its digits is 31104, while the sum is 35.

The square root of 623926421 is about 24978.5191914973. The cubic root of 623926421 is about 854.4981476312.

The spelling of 623926421 in words is "six hundred twenty-three million, nine hundred twenty-six thousand, four hundred twenty-one".