1621986147 has 16 divisors (see below), whose sum is σ = 2406705280. Its totient is φ = 1079630856.

The previous prime is 1621986139. The next prime is 1621986173. The reversal of 1621986147 is 7416891261.

1621986147 is a `hidden beast` number, since 1 + 6 + 21 + 9 + 8 + 614 + 7 = 666.

It is not a de Polignac number, because 1621986147 - 2³ = 1621986139 is a prime.

It is a super-2 number, since 2×1621986147² = 5261678122119811218, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1621982147) 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, 29353 + ... + 64074.

It is an arithmetic number, because the mean of its divisors is an integer number (150419080).

Almost surely, 2^1621986147 is an apocalyptic number.

1621986147 is a deficient number, since it is larger than the sum of its proper divisors (784719133).

1621986147 is an equidigital number, since it uses as much as digits as its factorization.

1621986147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94079 (or 94073 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 1621986147 is about 40273.8891466916. The cubic root of 1621986147 is about 1174.9400656316.

The spelling of 1621986147 in words is "one billion, six hundred twenty-one million, nine hundred eighty-six thousand, one hundred forty-seven".