1620471 has 4 divisors (see below), whose sum is σ = 2160632. Its totient is φ = 1080312.

The previous prime is 1620469. The next prime is 1620497. The reversal of 1620471 is 1740261.

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

It is not a de Polignac number, because 1620471 - 2¹ = 1620469 is a prime.

It is a super-3 number, since 3×1620471³ = 12765712066355241333, which contains 333 as substring.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 270076 + ... + 270081.

It is an arithmetic number, because the mean of its divisors is an integer number (540158).

2^1620471 is an apocalyptic number.

1620471 is a deficient number, since it is larger than the sum of its proper divisors (540161).

1620471 is an equidigital number, since it uses as much as digits as its factorization.

1620471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540160.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 1620471 is about 1272.9772189635. The cubic root of 1620471 is about 117.4574102473.

The spelling of 1620471 in words is "one million, six hundred twenty thousand, four hundred seventy-one".