1813542738 has 32 divisors (see below), whose sum is σ = 4169218176. Its totient is φ = 515157888.

The previous prime is 1813542737. The next prime is 1813542739. The reversal of 1813542738 is 8372453181.

It is an interprime number because it is at equal distance from previous prime (1813542737) and next prime (1813542739).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 1813542738.

It is not an unprimeable number, because it can be changed into a prime (1813542737) 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, 117531 + ... + 132062.

It is an arithmetic number, because the mean of its divisors is an integer number (130288068).

Almost surely, 2^1813542738 is an apocalyptic number.

1813542738 is an abundant number, since it is smaller than the sum of its proper divisors (2355675438).

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

1813542738 is a wasteful number, since it uses less digits than its factorization.

1813542738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249778.

The product of its digits is 161280, while the sum is 42.

The square root of 1813542738 is about 42585.7104907268. The cubic root of 1813542738 is about 1219.4835084169.

The spelling of 1813542738 in words is "one billion, eight hundred thirteen million, five hundred forty-two thousand, seven hundred thirty-eight".