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2640042 = 232146669
BaseRepresentation
bin1010000100100010101010
311222010110100
422010202222
51133440132
6132330230
731303626
oct12044252
94863410
102640042
111543559
12a73976
13715872
144ca186
1537237c
hex2848aa

2640042 has 12 divisors (see below), whose sum is σ = 5720130. Its totient is φ = 880008.

The previous prime is 2640041. The next prime is 2640059. The reversal of 2640042 is 2400462.

It can be written as a sum of positive squares in only one way, i.e., 2134521 + 505521 = 1461^2 + 711^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 146669 = 2640042 / (2 + 6 + 4 + 0 + 0 + 4 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 2639997 and 2640024.

It is not an unprimeable number, because it can be changed into a prime (2640041) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 73317 + ... + 73352.

22640042 is an apocalyptic number.

2640042 is an abundant number, since it is smaller than the sum of its proper divisors (3080088).

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

2640042 is a wasteful number, since it uses less digits than its factorization.

2640042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146677 (or 146674 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 2640042 is about 1624.8206054823. The cubic root of 2640042 is about 138.2091975200.

The spelling of 2640042 in words is "two million, six hundred forty thousand, forty-two".

Divisors: 1 2 3 6 9 18 146669 293338 440007 880014 1320021 2640042