1940797840 has 40 divisors (see below), whose sum is σ = 4537318968. Its totient is φ = 772024320.

The previous prime is 1940797801. The next prime is 1940797867. The reversal of 1940797840 is 487970491.

It can be written as a sum of positive squares in 4 ways, for example, as 571536 + 1940226304 = 756^2 + 44048^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-3 number, since 3×1940797840³ (a number of 29 digits) contains 333 as substring.

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, 52537 + ... + 81496.

Almost surely, 2^1940797840 is an apocalyptic number.

1940797840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1940797840 is an abundant number, since it is smaller than the sum of its proper divisors (2596521128).

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

1940797840 is a wasteful number, since it uses less digits than its factorization.

1940797840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134227 (or 134221 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 49.

The square root of 1940797840 is about 44054.4871721372. The cubic root of 1940797840 is about 1247.3646537313.

The spelling of 1940797840 in words is "one billion, nine hundred forty million, seven hundred ninety-seven thousand, eight hundred forty".