1940155840 has 112 divisors (see below), whose sum is σ = 5293059264. Its totient is φ = 663552000.

The previous prime is 1940155831. The next prime is 1940155901. The reversal of 1940155840 is 485510491.

It is a tau number, because it is divible by the number of its divisors (112).

It is a super-2 number, since 2×1940155840² = 7528409366972211200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1940155840.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1211040 + ... + 1212640.

Almost surely, 2^1940155840 is an apocalyptic number.

1940155840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1940155840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2646529632).

1940155840 is an abundant number, since it is smaller than the sum of its proper divisors (3352903424).

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

1940155840 is a wasteful number, since it uses less digits than its factorization.

1940155840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2166 (or 2156 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 37.

The square root of 1940155840 is about 44047.2001380337. The cubic root of 1940155840 is about 1247.2270992322.

The spelling of 1940155840 in words is "one billion, nine hundred forty million, one hundred fifty-five thousand, eight hundred forty".