438774861 has 24 divisors (see below), whose sum is σ = 683300800. Its totient is φ = 250344528.

The previous prime is 438774859. The next prime is 438774877. The reversal of 438774861 is 168477834.

It is not a de Polignac number, because 438774861 - 2¹ = 438774859 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 438774861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (438774821) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 671611 + ... + 672263.

Almost surely, 2^438774861 is an apocalyptic number.

It is an amenable number.

438774861 is a deficient number, since it is larger than the sum of its proper divisors (244525939).

438774861 is an frugal number, since it uses more digits than its factorization.

438774861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1330 (or 663 counting only the distinct ones).

The product of its digits is 903168, while the sum is 48.

The square root of 438774861 is about 20946.9535016431. The cubic root of 438774861 is about 759.8839048197.

The spelling of 438774861 in words is "four hundred thirty-eight million, seven hundred seventy-four thousand, eight hundred sixty-one".