1620734 has 4 divisors (see below), whose sum is σ = 2431104. Its totient is φ = 810366.

The previous prime is 1620733. The next prime is 1620739. The reversal of 1620734 is 4370261.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405182 + ... + 405185.

It is an arithmetic number, because the mean of its divisors is an integer number (607776).

2^1620734 is an apocalyptic number.

1620734 is a deficient number, since it is larger than the sum of its proper divisors (810370).

1620734 is an equidigital number, since it uses as much as digits as its factorization.

1620734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810369.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 1620734 is about 1273.0805159141. The cubic root of 1620734 is about 117.4637642905.

Adding to 1620734 its reverse (4370261), we get a palindrome (5990995).

The spelling of 1620734 in words is "one million, six hundred twenty thousand, seven hundred thirty-four".