623408381 has 2 divisors, whose sum is σ = 623408382. Its totient is φ = 623408380.

The previous prime is 623408371. The next prime is 623408431. The reversal of 623408381 is 183804326.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 451562500 + 171845881 = 21250^2 + 13109^2 .

It is a cyclic number.

It is not a de Polignac number, because 623408381 - 2²² = 619214077 is a prime.

It is a super-2 number, since 2×623408381² = 777276019002082322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (623408371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311704190 + 311704191.

It is an arithmetic number, because the mean of its divisors is an integer number (311704191).

Almost surely, 2^623408381 is an apocalyptic number.

It is an amenable number.

623408381 is a deficient number, since it is larger than the sum of its proper divisors (1).

623408381 is an equidigital number, since it uses as much as digits as its factorization.

623408381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 623408381 is about 24968.1473281459. The cubic root of 623408381 is about 854.2615883323.

The spelling of 623408381 in words is "six hundred twenty-three million, four hundred eight thousand, three hundred eighty-one".