1920687940 has 48 divisors (see below), whose sum is σ = 4094665344. Its totient is φ = 756704000.

The previous prime is 1920687919. The next prime is 1920687949. The reversal of 1920687940 is 497860291.

It is a super-2 number, since 2×1920687940² = 7378084325722887200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1920687949) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 356265 + ... + 361615.

It is an arithmetic number, because the mean of its divisors is an integer number (85305528).

Almost surely, 2^1920687940 is an apocalyptic number.

1920687940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1920687940 is an abundant number, since it is smaller than the sum of its proper divisors (2173977404).

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

1920687940 is a wasteful number, since it uses less digits than its factorization.

1920687940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5628 (or 5626 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 1920687940 is about 43825.6539027086. The cubic root of 1920687940 is about 1243.0414283732.

The spelling of 1920687940 in words is "one billion, nine hundred twenty million, six hundred eighty-seven thousand, nine hundred forty".