1620790 has 8 divisors (see below), whose sum is σ = 2917440. Its totient is φ = 648312.

The previous prime is 1620769. The next prime is 1620803. The reversal of 1620790 is 970261.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81030 + ... + 81049.

It is an arithmetic number, because the mean of its divisors is an integer number (364680).

2^1620790 is an apocalyptic number.

1620790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1620790 is a deficient number, since it is larger than the sum of its proper divisors (1296650).

1620790 is a wasteful number, since it uses less digits than its factorization.

1620790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162086.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 1620790 is about 1273.1025096197. The cubic root of 1620790 is about 117.4651171538.

The spelling of 1620790 in words is "one million, six hundred twenty thousand, seven hundred ninety".