207438138644 has 24 divisors (see below), whose sum is σ = 396053981568. Its totient is φ = 94281559040.

The previous prime is 207438138619. The next prime is 207438138653. The reversal of 207438138644 is 446831834702.

It is a junction number, because it is equal to n+sod(n) for n = 207438138592 and 207438138601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 294389 + ... + 708195.

It is an arithmetic number, because the mean of its divisors is an integer number (16502249232).

Almost surely, 2^207438138644 is an apocalyptic number.

It is an amenable number.

207438138644 is a deficient number, since it is larger than the sum of its proper divisors (188615842924).

207438138644 is a wasteful number, since it uses less digits than its factorization.

207438138644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425215 (or 425213 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 50.

The spelling of 207438138644 in words is "two hundred seven billion, four hundred thirty-eight million, one hundred thirty-eight thousand, six hundred forty-four".