438656377 has 2 divisors, whose sum is σ = 438656378. Its totient is φ = 438656376.

The previous prime is 438656371. The next prime is 438656419. The reversal of 438656377 is 773656834.

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., 436642816 + 2013561 = 20896^2 + 1419^2 .

It is a cyclic number.

It is not a de Polignac number, because 438656377 - 2¹⁵ = 438623609 is a prime.

It is a super-2 number, since 2×438656377² = 384838834165532258, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 438656377.

It is not a weakly prime, because it can be changed into another prime (438656371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219328188 + 219328189.

It is an arithmetic number, because the mean of its divisors is an integer number (219328189).

Almost surely, 2^438656377 is an apocalyptic number.

It is an amenable number.

438656377 is a deficient number, since it is larger than the sum of its proper divisors (1).

438656377 is an equidigital number, since it uses as much as digits as its factorization.

438656377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2540160, while the sum is 49.

The square root of 438656377 is about 20944.1251189922. The cubic root of 438656377 is about 759.8155005742.

The spelling of 438656377 in words is "four hundred thirty-eight million, six hundred fifty-six thousand, three hundred seventy-seven".