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2640421 = 72913007
BaseRepresentation
bin1010000100101000100101
311222010222101
422010220211
51133443141
6132332101
731305010
oct12045045
94863871
102640421
111543873
12a74031
13715aa4
144ca377
15372531
hex284a25

2640421 has 8 divisors (see below), whose sum is σ = 3121920. Its totient is φ = 2185008.

The previous prime is 2640409. The next prime is 2640497. The reversal of 2640421 is 1240462.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2k-2640421 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 (2640721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6301 + ... + 6706.

It is an arithmetic number, because the mean of its divisors is an integer number (390240).

22640421 is an apocalyptic number.

It is an amenable number.

2640421 is a deficient number, since it is larger than the sum of its proper divisors (481499).

2640421 is a wasteful number, since it uses less digits than its factorization.

2640421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13043.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 2640421 is about 1624.9372295569. The cubic root of 2640421 is about 138.2158108971.

Adding to 2640421 its reverse (1240462), we get a palindrome (3880883).

The spelling of 2640421 in words is "two million, six hundred forty thousand, four hundred twenty-one".

Divisors: 1 7 29 203 13007 91049 377203 2640421