1820372694 has 64 divisors (see below), whose sum is σ = 4377687552. Its totient is φ = 493689600.

The previous prime is 1820372693. The next prime is 1820372759. The reversal of 1820372694 is 4962730281.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820372693) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49429 + ... + 77999.

It is an arithmetic number, because the mean of its divisors is an integer number (68401368).

Almost surely, 2^1820372694 is an apocalyptic number.

1820372694 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1820372694, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2188843776).

1820372694 is an abundant number, since it is smaller than the sum of its proper divisors (2557314858).

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

1820372694 is a wasteful number, since it uses less digits than its factorization.

1820372694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28661.

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 1820372694 is about 42665.8258328607. The cubic root of 1820372694 is about 1221.0124834303.

The spelling of 1820372694 in words is "one billion, eight hundred twenty million, three hundred seventy-two thousand, six hundred ninety-four".