1620970 has 32 divisors (see below), whose sum is σ = 3236688. Its totient is φ = 580608.

The previous prime is 1620961. The next prime is 1620973. The reversal of 1620970 is 790261.

It can be written as a sum of positive squares in 8 ways, for example, as 558009 + 1062961 = 747^2 + 1031^2 .

It is a super-4 number, since 4×1620970⁴ (a number of 26 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4642 + ... + 4978.

It is the magic constant of a 148 × 148 magic square.

2^1620970 is an apocalyptic number.

1620970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1620970 is a deficient number, since it is larger than the sum of its proper divisors (1615718).

1620970 is a wasteful number, since it uses less digits than its factorization.

1620970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394.

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

The square root of 1620970 is about 1273.1732011003. The cubic root of 1620970 is about 117.4694654322.

The spelling of 1620970 in words is "one million, six hundred twenty thousand, nine hundred seventy".