1906857240 has 32 divisors (see below), whose sum is σ = 5720572080. Its totient is φ = 508495232.

The previous prime is 1906857223. The next prime is 1906857247. The reversal of 1906857240 is 427586091.

It is a super-2 number, since 2×1906857240² = 7272209067480835200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1906857192 and 1906857201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1906857247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7945119 + ... + 7945358.

Almost surely, 2^1906857240 is an apocalyptic number.

1906857240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1906857240 is an abundant number, since it is smaller than the sum of its proper divisors (3813714840).

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

1906857240 is a wasteful number, since it uses less digits than its factorization.

1906857240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15890491 (or 15890487 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 1906857240 is about 43667.5765299610. The cubic root of 1906857240 is about 1240.0505615873.

The spelling of 1906857240 in words is "one billion, nine hundred six million, eight hundred fifty-seven thousand, two hundred forty".