1620972 has 30 divisors (see below), whose sum is σ = 4238388. Its totient is φ = 540216.

The previous prime is 1620961. The next prime is 1620973. The reversal of 1620972 is 2790261.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 9 ways as a sum of consecutive naturals, for example, 2178 + ... + 2825.

2^1620972 is an apocalyptic number.

1620972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1620972 is an abundant number, since it is smaller than the sum of its proper divisors (2617416).

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

1620972 is a wasteful number, since it uses less digits than its factorization.

1620972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5019 (or 5008 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 1620972 is about 1273.1739865392. The cubic root of 1620972 is about 117.4695137446.

The spelling of 1620972 in words is "one million, six hundred twenty thousand, nine hundred seventy-two".