1799157438 has 72 divisors (see below), whose sum is σ = 4255250688. Its totient is φ = 549110016.

The previous prime is 1799157433. The next prime is 1799157457. The reversal of 1799157438 is 8347519971.

It is a happy number.

1799157438 is a `hidden beast` number, since 1 + 79 + 91 + 57 + 438 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1799157433) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 384006 + ... + 388662.

It is an arithmetic number, because the mean of its divisors is an integer number (59100704).

Almost surely, 2^1799157438 is an apocalyptic number.

1799157438 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1799157438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2127625344).

1799157438 is an abundant number, since it is smaller than the sum of its proper divisors (2456093250).

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

1799157438 is a wasteful number, since it uses less digits than its factorization.

1799157438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4818 (or 4802 counting only the distinct ones).

The product of its digits is 1905120, while the sum is 54.

The square root of 1799157438 is about 42416.4760205277. The cubic root of 1799157438 is about 1216.2505682968.

The spelling of 1799157438 in words is "one billion, seven hundred ninety-nine million, one hundred fifty-seven thousand, four hundred thirty-eight".