2621401 has 4 divisors (see below), whose sum is σ = 2640400. Its totient is φ = 2602404.

The previous prime is 2621387. The next prime is 2621431. The reversal of 2621401 is 1041262.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1041262 = 2 ⋅520631.

It is a cyclic number.

It is not a de Polignac number, because 2621401 - 2⁵ = 2621369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2621431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9291 + ... + 9568.

It is an arithmetic number, because the mean of its divisors is an integer number (660100).

2^2621401 is an apocalyptic number.

It is an amenable number.

2621401 is a deficient number, since it is larger than the sum of its proper divisors (18999).

2621401 is a wasteful number, since it uses less digits than its factorization.

2621401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18998.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 2621401 is about 1619.0741181305. The cubic root of 2621401 is about 137.8831363781.

Adding to 2621401 its reverse (1041262), we get a palindrome (3662663).

The spelling of 2621401 in words is "two million, six hundred twenty-one thousand, four hundred one".