1620456 has 32 divisors (see below), whose sum is σ = 4082400. Its totient is φ = 536000.

The previous prime is 1620449. The next prime is 1620461. The reversal of 1620456 is 6540261.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

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, 5890 + ... + 6158.

It is an arithmetic number, because the mean of its divisors is an integer number (127575).

2^1620456 is an apocalyptic number.

It is an amenable number.

1620456 is an abundant number, since it is smaller than the sum of its proper divisors (2461944).

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

1620456 is a wasteful number, since it uses less digits than its factorization.

1620456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 529 (or 525 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 1620456 is about 1272.9713272498. The cubic root of 1620456 is about 117.4570478287.

It can be divided in two parts, 1620 and 456, that multiplied together give a triangular number (738720 = T₁₂₁₅).

The spelling of 1620456 in words is "one million, six hundred twenty thousand, four hundred fifty-six".