1620487 has 8 divisors (see below), whose sum is σ = 1779840. Its totient is φ = 1463160.

The previous prime is 1620469. The next prime is 1620497. The reversal of 1620487 is 7840261.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1620487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620467) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1558 + ... + 2380.

It is an arithmetic number, because the mean of its divisors is an integer number (222480).

2^1620487 is an apocalyptic number.

1620487 is a deficient number, since it is larger than the sum of its proper divisors (159353).

1620487 is a wasteful number, since it uses less digits than its factorization.

1620487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1013.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 1620487 is about 1272.9835034281. The cubic root of 1620487 is about 117.4577968247.

It can be divided in two parts, 16 and 20487, that added together give a triangular number (20503 = T₂₀₂).

The spelling of 1620487 in words is "one million, six hundred twenty thousand, four hundred eighty-seven".