1604961 has 8 divisors (see below), whose sum is σ = 2377760. Its totient is φ = 1069956.

The previous prime is 1604957. The next prime is 1604983. The reversal of 1604961 is 1694061.

It is not a de Polignac number, because 1604961 - 2² = 1604957 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 59443 = 1604961 / (1 + 6 + 0 + 4 + 9 + 6 + 1).

It is a Duffinian number.

1604961 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1604951) 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, 29695 + ... + 29748.

It is an arithmetic number, because the mean of its divisors is an integer number (297220).

2^1604961 is an apocalyptic number.

It is an amenable number.

1604961 is a deficient number, since it is larger than the sum of its proper divisors (772799).

1604961 is an equidigital number, since it uses as much as digits as its factorization.

1604961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59452 (or 59446 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 1604961 is about 1266.8705537662. The cubic root of 1604961 is about 117.0814685715.

It can be divided in two parts, 16049 and 61, that added together give a triangular number (16110 = T₁₇₉).

The spelling of 1604961 in words is "one million, six hundred four thousand, nine hundred sixty-one".