1620642 has 16 divisors (see below), whose sum is σ = 3256992. Its totient is φ = 537600.

The previous prime is 1620631. The next prime is 1620667. The reversal of 1620642 is 2460261.

It is a happy number.

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1017 + ... + 2067.

It is an arithmetic number, because the mean of its divisors is an integer number (203562).

2^1620642 is an apocalyptic number.

1620642 is an abundant number, since it is smaller than the sum of its proper divisors (1636350).

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

1620642 is a wasteful number, since it uses less digits than its factorization.

1620642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1313.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 1620642 is about 1273.0443825727. The cubic root of 1620642 is about 117.4615416615.

The spelling of 1620642 in words is "one million, six hundred twenty thousand, six hundred forty-two".