438902177861 has 16 divisors (see below), whose sum is σ = 505451424384. Its totient is φ = 373321376064.

The previous prime is 438902177801. The next prime is 438902177863. The reversal of 438902177861 is 168771209834.

It is a de Polignac number, because none of the positive numbers 2^k-438902177861 is a prime.

It is a super-2 number, since 2×438902177861² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 438902177797 and 438902177806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (438902177863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 591206 + ... + 1107848.

It is an arithmetic number, because the mean of its divisors is an integer number (31590714024).

Almost surely, 2^438902177861 is an apocalyptic number.

It is an amenable number.

438902177861 is a deficient number, since it is larger than the sum of its proper divisors (66549246523).

438902177861 is a wasteful number, since it uses less digits than its factorization.

438902177861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517580.

The product of its (nonzero) digits is 4064256, while the sum is 56.

The spelling of 438902177861 in words is "four hundred thirty-eight billion, nine hundred two million, one hundred seventy-seven thousand, eight hundred sixty-one".