1900994840 has 64 divisors (see below), whose sum is σ = 4525567200. Its totient is φ = 716663808.

The previous prime is 1900994833. The next prime is 1900994861. The reversal of 1900994840 is 484990091.

1900994840 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×1900994840² = 7227562763413251200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1900994791 and 1900994800.

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, 143372 + ... + 156068.

Almost surely, 2^1900994840 is an apocalyptic number.

1900994840 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 1900994840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2262783600).

1900994840 is an abundant number, since it is smaller than the sum of its proper divisors (2624572360).

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

1900994840 is a wasteful number, since it uses less digits than its factorization.

1900994840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12924 (or 12920 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 1900994840 is about 43600.3995394538. The cubic root of 1900994840 is about 1238.7784623241.

The spelling of 1900994840 in words is "one billion, nine hundred million, nine hundred ninety-four thousand, eight hundred forty".