1621463 has 4 divisors (see below), whose sum is σ = 1624080. Its totient is φ = 1618848.

The previous prime is 1621457. The next prime is 1621469. The reversal of 1621463 is 3641261.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3641261 = 13 ⋅280097.

It is an interprime number because it is at equal distance from previous prime (1621457) and next prime (1621469).

It is a cyclic number.

It is not a de Polignac number, because 1621463 - 2¹⁰ = 1620439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621469) 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, 206 + ... + 1812.

It is an arithmetic number, because the mean of its divisors is an integer number (406020).

2^1621463 is an apocalyptic number.

1621463 is a deficient number, since it is larger than the sum of its proper divisors (2617).

1621463 is a wasteful number, since it uses less digits than its factorization.

1621463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2616.

The product of its digits is 864, while the sum is 23.

The square root of 1621463 is about 1273.3667971170. The cubic root of 1621463 is about 117.4813732357.

The spelling of 1621463 in words is "one million, six hundred twenty-one thousand, four hundred sixty-three".