1620534 has 16 divisors (see below), whose sum is σ = 3382272. Its totient is φ = 516648.

The previous prime is 1620523. The next prime is 1620539. The reversal of 1620534 is 4350261.

1620534 = 635² + 636² + ... + 638².

It is a happy number.

It is a super-2 number, since 2×1620534² = 5252260890312, which contains 22 as substring.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1620534.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620539) 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, 5734 + ... + 6009.

It is an arithmetic number, because the mean of its divisors is an integer number (211392).

2^1620534 is an apocalyptic number.

1620534 is an abundant number, since it is smaller than the sum of its proper divisors (1761738).

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

1620534 is a wasteful number, since it uses less digits than its factorization.

1620534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11771.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 1620534 is about 1273.0019638634. The cubic root of 1620534 is about 117.4589323811.

Adding to 1620534 its reverse (4350261), we get a palindrome (5970795).

The spelling of 1620534 in words is "one million, six hundred twenty thousand, five hundred thirty-four".