1816938940 has 24 divisors (see below), whose sum is σ = 3817996560. Its totient is φ = 726313728.

The previous prime is 1816938931. The next prime is 1816938947. The reversal of 1816938940 is 498396181.

It is a super-2 number, since 2×1816938940² = 6602534223376647200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1816938947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4324 + ... + 60436.

It is an arithmetic number, because the mean of its divisors is an integer number (159083190).

Almost surely, 2^1816938940 is an apocalyptic number.

1816938940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1816938940 is an abundant number, since it is smaller than the sum of its proper divisors (2001057620).

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

1816938940 is a wasteful number, since it uses less digits than its factorization.

1816938940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57741 (or 57739 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 49.

The square root of 1816938940 is about 42625.5667411003. The cubic root of 1816938940 is about 1220.2442716112.

The spelling of 1816938940 in words is "one billion, eight hundred sixteen million, nine hundred thirty-eight thousand, nine hundred forty".