438381021854 has 4 divisors (see below), whose sum is σ = 657571532784. Its totient is φ = 219190510926.

The previous prime is 438381021823. The next prime is 438381021877. The reversal of 438381021854 is 458120183834.

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

It is a junction number, because it is equal to n+sod(n) for n = 438381021799 and 438381021808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109595255462 + ... + 109595255465.

It is an arithmetic number, because the mean of its divisors is an integer number (164392883196).

Almost surely, 2^438381021854 is an apocalyptic number.

438381021854 is a deficient number, since it is larger than the sum of its proper divisors (219190510930).

438381021854 is a wasteful number, since it uses less digits than its factorization.

438381021854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219190510929.

The product of its (nonzero) digits is 737280, while the sum is 47.

The spelling of 438381021854 in words is "four hundred thirty-eight billion, three hundred eighty-one million, twenty-one thousand, eight hundred fifty-four".