438215540 has 24 divisors (see below), whose sum is σ = 1051717632. Its totient is φ = 150245280.

The previous prime is 438215509. The next prime is 438215551. The reversal of 438215540 is 45512834.

It is a junction number, because it is equal to n+sod(n) for n = 438215497 and 438215506.

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, 1564916 + ... + 1565195.

It is an arithmetic number, because the mean of its divisors is an integer number (43821568).

Almost surely, 2^438215540 is an apocalyptic number.

It is an amenable number.

438215540 is an abundant number, since it is smaller than the sum of its proper divisors (613502092).

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

438215540 is a wasteful number, since it uses less digits than its factorization.

438215540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3130127 (or 3130125 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 32.

The square root of 438215540 is about 20933.5983528872. The cubic root of 438215540 is about 759.5608843775.

The spelling of 438215540 in words is "four hundred thirty-eight million, two hundred fifteen thousand, five hundred forty".