1620149 has 8 divisors (see below), whose sum is σ = 1730880. Its totient is φ = 1512000.

The previous prime is 1620133. The next prime is 1620161. The reversal of 1620149 is 9410261.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1620149 - 2⁴ = 1620133 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 749 + ... + 1949.

It is an arithmetic number, because the mean of its divisors is an integer number (216360).

2^1620149 is an apocalyptic number.

1620149 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1620149 is a deficient number, since it is larger than the sum of its proper divisors (110731).

1620149 is a wasteful number, since it uses less digits than its factorization.

1620149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1291.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 1620149 is about 1272.8507375180. The cubic root of 1620149 is about 117.4496298363.

The spelling of 1620149 in words is "one million, six hundred twenty thousand, one hundred forty-nine".