1621986146 has 16 divisors (see below), whose sum is σ = 2654782560. Its totient is φ = 737093280.

The previous prime is 1621986139. The next prime is 1621986173. The reversal of 1621986146 is 6416891261.

It is a junction number, because it is equal to n+sod(n) for n = 1621986097 and 1621986106.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161150 + ... + 170918.

It is an arithmetic number, because the mean of its divisors is an integer number (165923910).

Almost surely, 2^1621986146 is an apocalyptic number.

1621986146 is a deficient number, since it is larger than the sum of its proper divisors (1032796414).

1621986146 is a wasteful number, since it uses less digits than its factorization.

1621986146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17329.

The product of its digits is 124416, while the sum is 44.

The square root of 1621986146 is about 40273.8891342766. The cubic root of 1621986146 is about 1174.9400653902.

The spelling of 1621986146 in words is "one billion, six hundred twenty-one million, nine hundred eighty-six thousand, one hundred forty-six".