626423421 has 16 divisors (see below), whose sum is σ = 899932544. Its totient is φ = 385297344.

The previous prime is 626423419. The next prime is 626423449. The reversal of 626423421 is 124324626.

It is not a de Polignac number, because 626423421 - 2¹ = 626423419 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 (626423471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134880 + ... + 139446.

It is an arithmetic number, because the mean of its divisors is an integer number (56245784).

Almost surely, 2^626423421 is an apocalyptic number.

It is an amenable number.

626423421 is a deficient number, since it is larger than the sum of its proper divisors (273509123).

626423421 is a wasteful number, since it uses less digits than its factorization.

626423421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8100.

The product of its digits is 13824, while the sum is 30.

The square root of 626423421 is about 25028.4522294128. The cubic root of 626423421 is about 855.6365520595.

The spelling of 626423421 in words is "six hundred twenty-six million, four hundred twenty-three thousand, four hundred twenty-one".