623438386 has 4 divisors (see below), whose sum is σ = 935157582. Its totient is φ = 311719192.

The previous prime is 623438377. The next prime is 623438401. The reversal of 623438386 is 683834326.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 329967225 + 293471161 = 18165^2 + 17131^2 .

It is a super-2 number, since 2×623438386² = 777350842276569992, which contains 22 as substring.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 155859595 + ... + 155859598.

Almost surely, 2^623438386 is an apocalyptic number.

623438386 is a deficient number, since it is larger than the sum of its proper divisors (311719196).

623438386 is a wasteful number, since it uses less digits than its factorization.

623438386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311719195.

The product of its digits is 497664, while the sum is 43.

The square root of 623438386 is about 24968.7481864830. The cubic root of 623438386 is about 854.2752934778.

The spelling of 623438386 in words is "six hundred twenty-three million, four hundred thirty-eight thousand, three hundred eighty-six".