1966820490 has 24 divisors (see below), whose sum is σ = 5113733508. Its totient is φ = 524485440.

The previous prime is 1966820489. The next prime is 1966820501. The reversal of 1966820490 is 940286691.

It is a happy number.

1966820490 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 1912400361 + 54420129 = 43731^2 + 7377^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10926691 + ... + 10926870.

Almost surely, 2^1966820490 is an apocalyptic number.

1966820490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1966820490 is an abundant number, since it is smaller than the sum of its proper divisors (3146913018).

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

1966820490 is a wasteful number, since it uses less digits than its factorization.

1966820490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21853574 (or 21853571 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 1966820490 is about 44348.8499287186. The cubic root of 1966820490 is about 1252.9149019271.

The spelling of 1966820490 in words is "one billion, nine hundred sixty-six million, eight hundred twenty thousand, four hundred ninety".