2138596440 has 64 divisors (see below), whose sum is σ = 6449448960. Its totient is φ = 567300480.

The previous prime is 2138596409. The next prime is 2138596451. The reversal of 2138596440 is 446958312.

It is a junction number, because it is equal to n+sod(n) for n = 2138596392 and 2138596401.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23734 + ... + 69573.

It is an arithmetic number, because the mean of its divisors is an integer number (100772640).

Almost surely, 2^2138596440 is an apocalyptic number.

2138596440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2138596440 is an abundant number, since it is smaller than the sum of its proper divisors (4310852520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2138596440 is a wasteful number, since it uses less digits than its factorization.

2138596440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93512 (or 93508 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 42.

The square root of 2138596440 is about 46244.9612390366. The cubic root of 2138596440 is about 1288.3769504183.

The spelling of 2138596440 in words is "two billion, one hundred thirty-eight million, five hundred ninety-six thousand, four hundred forty".