1624397 has 4 divisors (see below), whose sum is σ = 1655100. Its totient is φ = 1593696.

The previous prime is 1624387. The next prime is 1624417. The reversal of 1624397 is 7934261.

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

It can be written as a sum of positive squares in 2 ways, for example, as 481636 + 1142761 = 694^2 + 1069^2 .

It is a cyclic number.

It is not a de Polignac number, because 1624397 - 2⁸ = 1624141 is a prime.

It is a super-2 number, since 2×1624397² = 5277331227218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1624327) 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, 15272 + ... + 15377.

It is an arithmetic number, because the mean of its divisors is an integer number (413775).

2^1624397 is an apocalyptic number.

It is an amenable number.

1624397 is a deficient number, since it is larger than the sum of its proper divisors (30703).

1624397 is an equidigital number, since it uses as much as digits as its factorization.

1624397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30702.

The product of its digits is 9072, while the sum is 32.

The square root of 1624397 is about 1274.5183403937. The cubic root of 1624397 is about 117.5521904862.

The spelling of 1624397 in words is "one million, six hundred twenty-four thousand, three hundred ninety-seven".